diff --git a/backend/go-service/app/contact/controller/contact_controller.go b/backend/go-service/app/contact/controller/contact_controller.go
new file mode 100644
index 0000000..e23724f
--- /dev/null
+++ b/backend/go-service/app/contact/controller/contact_controller.go
@@ -0,0 +1,448 @@
+// Package controller 提供 contact 模块的 HTTP 接口处理
+package controller
+
+import (
+	"strconv"
+
+	"github.com/echochat/backend/app/contact/service"
+	"github.com/echochat/backend/app/dto"
+	"github.com/echochat/backend/pkg/middleware"
+	"github.com/echochat/backend/pkg/utils"
+	"github.com/gin-gonic/gin"
+)
+
+// ContactController 联系人控制器
+type ContactController struct {
+	contactService *service.ContactService
+}
+
+// NewContactController 创建 ContactController 实例
+func NewContactController(contactService *service.ContactService) *ContactController {
+	return &ContactController{contactService: contactService}
+}
+
+// GetFriendList 获取好友列表
+// GET /api/v1/contacts?group_id=xx
+func (ctl *ContactController) GetFriendList(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	var groupID *int64
+	if gid := c.Query("group_id"); gid != "" {
+		id, err := strconv.ParseInt(gid, 10, 64)
+		if err == nil {
+			groupID = &id
+		}
+	}
+
+	friends, err := ctl.contactService.GetFriendList(ctx, userID, groupID)
+	if err != nil {
+		utils.ResponseError(c, "获取好友列表失败")
+		return
+	}
+	utils.ResponseOK(c, friends)
+}
+
+// SendFriendRequest 发送好友申请
+// POST /api/v1/contacts/request
+func (ctl *ContactController) SendFriendRequest(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	var req dto.SendFriendRequestReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "请求参数错误: "+err.Error())
+		return
+	}
+
+	err := ctl.contactService.SendFriendRequest(ctx, userID, req.TargetID, req.Message)
+	if err != nil {
+		ctl.handleError(c, err)
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// AcceptFriendRequest 接受好友申请
+// POST /api/v1/contacts/accept
+func (ctl *ContactController) AcceptFriendRequest(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	var req dto.HandleFriendRequestReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "请求参数错误: "+err.Error())
+		return
+	}
+
+	err := ctl.contactService.AcceptFriendRequest(ctx, req.RequestID, userID)
+	if err != nil {
+		ctl.handleError(c, err)
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// RejectFriendRequest 拒绝好友申请
+// POST /api/v1/contacts/reject
+func (ctl *ContactController) RejectFriendRequest(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	var req dto.HandleFriendRequestReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "请求参数错误: "+err.Error())
+		return
+	}
+
+	err := ctl.contactService.RejectFriendRequest(ctx, req.RequestID, userID)
+	if err != nil {
+		ctl.handleError(c, err)
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// GetPendingRequests 获取待处理的好友申请列表
+// GET /api/v1/contacts/requests
+func (ctl *ContactController) GetPendingRequests(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	requests, err := ctl.contactService.GetPendingRequests(ctx, userID)
+	if err != nil {
+		utils.ResponseError(c, "获取好友申请列表失败")
+		return
+	}
+	utils.ResponseOK(c, requests)
+}
+
+// DeleteFriend 删除好友
+// DELETE /api/v1/contacts/:id
+func (ctl *ContactController) DeleteFriend(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	friendID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "好友 ID 格式错误")
+		return
+	}
+
+	if err := ctl.contactService.DeleteFriend(ctx, userID, friendID); err != nil {
+		utils.ResponseError(c, "删除好友失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// UpdateRemark 设置好友备注
+// PUT /api/v1/contacts/:id/remark
+func (ctl *ContactController) UpdateRemark(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	friendID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "好友 ID 格式错误")
+		return
+	}
+
+	var req dto.UpdateRemarkReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "请求参数错误: "+err.Error())
+		return
+	}
+
+	if err := ctl.contactService.UpdateRemark(ctx, userID, friendID, req.Remark); err != nil {
+		utils.ResponseError(c, "更新备注失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// BlockUser 拉黑用户
+// POST /api/v1/contacts/block
+func (ctl *ContactController) BlockUser(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	var req dto.BlockUserReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "请求参数错误: "+err.Error())
+		return
+	}
+
+	err := ctl.contactService.BlockUser(ctx, userID, req.TargetID)
+	if err != nil {
+		ctl.handleError(c, err)
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// UnblockUser 取消拉黑
+// DELETE /api/v1/contacts/block/:user_id
+func (ctl *ContactController) UnblockUser(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	targetID, err := strconv.ParseInt(c.Param("user_id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "用户 ID 格式错误")
+		return
+	}
+
+	if err := ctl.contactService.UnblockUser(ctx, userID, targetID); err != nil {
+		utils.ResponseError(c, "取消拉黑失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// GetBlockList 获取黑名单列表
+// GET /api/v1/contacts/block
+func (ctl *ContactController) GetBlockList(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	blocked, err := ctl.contactService.GetBlockList(ctx, userID)
+	if err != nil {
+		utils.ResponseError(c, "获取黑名单失败")
+		return
+	}
+	utils.ResponseOK(c, blocked)
+}
+
+// SearchUsers 搜索用户
+// GET /api/v1/users/search?keyword=xx&page=1&page_size=20
+func (ctl *ContactController) SearchUsers(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	keyword := c.Query("keyword")
+	if keyword == "" {
+		utils.ResponseBadRequest(c, "搜索关键词不能为空")
+		return
+	}
+
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+
+	users, total, err := ctl.contactService.SearchUsers(ctx, userID, keyword, page, pageSize)
+	if err != nil {
+		utils.ResponseError(c, "搜索用户失败")
+		return
+	}
+	utils.ResponseOK(c, gin.H{
+		"list":  users,
+		"total": total,
+	})
+}
+
+// GetRecommendFriends 好友推荐
+// GET /api/v1/contacts/recommend
+func (ctl *ContactController) GetRecommendFriends(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	friends, err := ctl.contactService.GetRecommendFriends(ctx, userID)
+	if err != nil {
+		utils.ResponseError(c, "获取好友推荐失败")
+		return
+	}
+	utils.ResponseOK(c, friends)
+}
+
+// GetGroups 获取好友分组列表
+// GET /api/v1/contacts/groups
+func (ctl *ContactController) GetGroups(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groups, err := ctl.contactService.GetGroups(ctx, userID)
+	if err != nil {
+		utils.ResponseError(c, "获取分组列表失败")
+		return
+	}
+	utils.ResponseOK(c, groups)
+}
+
+// CreateGroup 创建好友分组
+// POST /api/v1/contacts/groups
+func (ctl *ContactController) CreateGroup(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	var req dto.CreateGroupReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "请求参数错误: "+err.Error())
+		return
+	}
+
+	group, err := ctl.contactService.CreateGroup(ctx, userID, req.Name)
+	if err != nil {
+		utils.ResponseError(c, "创建分组失败")
+		return
+	}
+	utils.ResponseCreated(c, group)
+}
+
+// UpdateGroup 修改好友分组
+// PUT /api/v1/contacts/groups/:id
+func (ctl *ContactController) UpdateGroup(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "分组 ID 格式错误")
+		return
+	}
+
+	var req dto.UpdateGroupReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "请求参数错误: "+err.Error())
+		return
+	}
+
+	if err := ctl.contactService.UpdateGroup(ctx, userID, groupID, req.Name, req.SortOrder); err != nil {
+		utils.ResponseError(c, "修改分组失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// DeleteGroup 删除好友分组
+// DELETE /api/v1/contacts/groups/:id
+func (ctl *ContactController) DeleteGroup(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "分组 ID 格式错误")
+		return
+	}
+
+	if err := ctl.contactService.DeleteGroup(ctx, userID, groupID); err != nil {
+		utils.ResponseError(c, "删除分组失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// MoveToGroup 移动好友到分组
+// PUT /api/v1/contacts/:id/group
+func (ctl *ContactController) MoveToGroup(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	friendID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "好友 ID 格式错误")
+		return
+	}
+
+	var req dto.MoveToGroupReq
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "请求参数错误: "+err.Error())
+		return
+	}
+
+	if err := ctl.contactService.MoveToGroup(ctx, userID, friendID, req.GroupID); err != nil {
+		utils.ResponseError(c, "移动好友到分组失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// handleError 统一错误处理
+func (ctl *ContactController) handleError(c *gin.Context, err error) {
+	switch err {
+	case service.ErrSelfRequest:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrAlreadyFriend:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrPendingExists:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrBlocked:
+		utils.ResponseForbidden(c, err.Error())
+	case service.ErrRequestNotFound:
+		utils.ResponseNotFound(c, err.Error())
+	case service.ErrFriendNotFound:
+		utils.ResponseNotFound(c, err.Error())
+	case service.ErrGroupNotFound:
+		utils.ResponseNotFound(c, err.Error())
+	default:
+		utils.ResponseError(c, "服务内部错误")
+	}
+}
diff --git a/backend/go-service/app/contact/provider.go b/backend/go-service/app/contact/provider.go
new file mode 100644
index 0000000..dc13d8c
--- /dev/null
+++ b/backend/go-service/app/contact/provider.go
@@ -0,0 +1,16 @@
+package contact
+
+import (
+	"github.com/echochat/backend/app/contact/controller"
+	"github.com/echochat/backend/app/contact/dao"
+	"github.com/echochat/backend/app/contact/service"
+	"github.com/google/wire"
+)
+
+// ContactSet Contact 模块依赖注入 Provider Set
+var ContactSet = wire.NewSet(
+	dao.NewFriendshipDAO,
+	dao.NewFriendGroupDAO,
+	service.NewContactService,
+	controller.NewContactController,
+)
diff --git a/backend/go-service/app/contact/router.go b/backend/go-service/app/contact/router.go
new file mode 100644
index 0000000..e9152af
--- /dev/null
+++ b/backend/go-service/app/contact/router.go
@@ -0,0 +1,39 @@
+// Package contact 提供联系人/好友管理模块
+package contact
+
+import (
+	"github.com/echochat/backend/app/contact/controller"
+	"github.com/gin-gonic/gin"
+)
+
+// RegisterRoutes 注册 contact 模块的所有路由（需要 JWT 中间件）
+func RegisterRoutes(r *gin.Engine, ctrl *controller.ContactController, jwtAuth gin.HandlerFunc) {
+	authed := r.Group("/api/v1")
+	authed.Use(jwtAuth)
+	{
+		// 好友关系
+		authed.GET("/contacts", ctrl.GetFriendList)
+		authed.POST("/contacts/request", ctrl.SendFriendRequest)
+		authed.POST("/contacts/accept", ctrl.AcceptFriendRequest)
+		authed.POST("/contacts/reject", ctrl.RejectFriendRequest)
+		authed.DELETE("/contacts/:id", ctrl.DeleteFriend)
+		authed.PUT("/contacts/:id/remark", ctrl.UpdateRemark)
+		authed.GET("/contacts/requests", ctrl.GetPendingRequests)
+
+		// 好友分组
+		authed.GET("/contacts/groups", ctrl.GetGroups)
+		authed.POST("/contacts/groups", ctrl.CreateGroup)
+		authed.PUT("/contacts/groups/:id", ctrl.UpdateGroup)
+		authed.DELETE("/contacts/groups/:id", ctrl.DeleteGroup)
+		authed.PUT("/contacts/:id/group", ctrl.MoveToGroup)
+
+		// 黑名单
+		authed.POST("/contacts/block", ctrl.BlockUser)
+		authed.DELETE("/contacts/block/:user_id", ctrl.UnblockUser)
+		authed.GET("/contacts/block", ctrl.GetBlockList)
+
+		// 搜索与推荐
+		authed.GET("/users/search", ctrl.SearchUsers)
+		authed.GET("/contacts/recommend", ctrl.GetRecommendFriends)
+	}
+}
diff --git a/backend/go-service/app/provider/provider.go b/backend/go-service/app/provider/provider.go
index f287489..63e2289 100644
--- a/backend/go-service/app/provider/provider.go
+++ b/backend/go-service/app/provider/provider.go
@@ -6,6 +6,7 @@ import (
 	adminController "github.com/echochat/backend/app/admin/controller"
 	authController "github.com/echochat/backend/app/auth/controller"
 	"github.com/echochat/backend/app/auth/service"
+	contactController "github.com/echochat/backend/app/contact/controller"
 	wsApp "github.com/echochat/backend/app/ws"
 	"github.com/echochat/backend/config"
 	"github.com/echochat/backend/pkg/db"
@@ -27,6 +28,7 @@ type App struct {
 	WSHandler             *wsApp.Handler                              // WebSocket 连接处理器
 	Hub                   *ws.Hub                                     // WebSocket Hub 连接管理
 	PubSub                *ws.PubSub                                  // Redis Pub/Sub 消息路由
+	ContactController     *contactController.ContactController        // 联系人控制器
 }
 
 // NewApp 创建应用实例
@@ -41,6 +43,7 @@ func NewApp(
 	wsHandler *wsApp.Handler,
 	hub *ws.Hub,
 	pubsub *ws.PubSub,
+	contactCtrl *contactController.ContactController,
 ) *App {
 	return &App{
 		Config:                cfg,
@@ -53,6 +56,7 @@ func NewApp(
 		WSHandler:             wsHandler,
 		Hub:                   hub,
 		PubSub:                pubsub,
+		ContactController:     contactCtrl,
 	}
 }
 
diff --git a/backend/go-service/app/provider/wire.go b/backend/go-service/app/provider/wire.go
index 15eeea7..9e88c87 100644
--- a/backend/go-service/app/provider/wire.go
+++ b/backend/go-service/app/provider/wire.go
@@ -6,6 +6,7 @@ package provider
 import (
 	"github.com/echochat/backend/app/admin"
 	"github.com/echochat/backend/app/auth"
+	"github.com/echochat/backend/app/contact"
 	wsApp "github.com/echochat/backend/app/ws"
 	"github.com/echochat/backend/config"
 	"github.com/google/wire"
@@ -18,6 +19,7 @@ func InitializeApp(cfg *config.Config) (*App, error) {
 		auth.AuthSet,
 		admin.AdminSet,
 		wsApp.WSSet,
+		contact.ContactSet,
 	)
 	return nil, nil
 }
diff --git a/backend/go-service/app/provider/wire_gen.go b/backend/go-service/app/provider/wire_gen.go
index 4c13c32..ee6a610 100644
--- a/backend/go-service/app/provider/wire_gen.go
+++ b/backend/go-service/app/provider/wire_gen.go
@@ -13,6 +13,9 @@ import (
 	"github.com/echochat/backend/app/auth/controller"
 	"github.com/echochat/backend/app/auth/dao"
 	"github.com/echochat/backend/app/auth/service"
+	controller3 "github.com/echochat/backend/app/contact/controller"
+	dao3 "github.com/echochat/backend/app/contact/dao"
+	service3 "github.com/echochat/backend/app/contact/service"
 	"github.com/echochat/backend/app/ws"
 	"github.com/echochat/backend/config"
 	"github.com/echochat/backend/pkg/db"
@@ -45,6 +48,10 @@ func InitializeApp(cfg *config.Config) (*App, error) {
 	hub := ws.ProvideHub()
 	pubSub := ws.ProvidePubSub(client, hub)
 	handler := ws.ProvideWSHandler(hub, pubSub, jwtConfig)
-	app := NewApp(cfg, gormDB, client, authService, authController, adminAuthController, userManageController, handler, hub, pubSub)
+	friendshipDAO := dao3.NewFriendshipDAO(gormDB)
+	friendGroupDAO := dao3.NewFriendGroupDAO(gormDB)
+	contactService := service3.NewContactService(friendshipDAO, friendGroupDAO, pubSub)
+	contactController := controller3.NewContactController(contactService)
+	app := NewApp(cfg, gormDB, client, authService, authController, adminAuthController, userManageController, handler, hub, pubSub, contactController)
 	return app, nil
 }
diff --git a/backend/go-service/router/router.go b/backend/go-service/router/router.go
index 6a28357..6be4369 100644
--- a/backend/go-service/router/router.go
+++ b/backend/go-service/router/router.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/echochat/backend/app/admin"
 	"github.com/echochat/backend/app/auth"
+	"github.com/echochat/backend/app/contact"
 	"github.com/echochat/backend/app/provider"
 	wsApp "github.com/echochat/backend/app/ws"
 	"github.com/echochat/backend/pkg/middleware"
@@ -34,6 +35,7 @@ func Setup(engine *gin.Engine, app *provider.App) {
 	auth.RegisterRoutes(engine, app.AuthController, app.AdminAuthController, jwtAuth)
 	admin.RegisterRoutes(engine, app.UserManageController, jwtAuth)
 	wsApp.RegisterRoutes(engine, app.WSHandler)
+	contact.RegisterRoutes(engine, app.ContactController, jwtAuth)
 
 	// [未来] im.RegisterRoutes(engine, app.ImController, jwtAuth)
 	// [未来] meeting.RegisterRoutes(engine, app.MeetingController, jwtAuth)