diff --git a/backend/cmd/server/main.go b/backend/cmd/server/main.go
index 61edbaf..9b508f2 100644
--- a/backend/cmd/server/main.go
+++ b/backend/cmd/server/main.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 
+	"github.com/hhs/camtalk/internal/api"
 	"github.com/hhs/camtalk/internal/ai/llm"
 	"github.com/hhs/camtalk/internal/ai/stt"
 	"github.com/hhs/camtalk/internal/ai/tts"
@@ -61,11 +62,15 @@ func main() {
 	r.Use(gin.Recovery())
 
 	// REST API
-	api := r.Group("/api")
+	apiGroup := r.Group("/api")
 	{
-		api.GET("/health", healthHandler(sessionMgr))
+		apiGroup.GET("/health", healthHandler(sessionMgr))
 	}
 
+	// Session REST 端点
+	sessionHandler := api.NewSessionHandler(sessionMgr)
+	sessionHandler.RegisterRoutes(apiGroup)
+
 	// WebSocket
 	r.GET("/ws", ws.ServeWS(sessionMgr, orch))
 
@@ -106,7 +111,7 @@ func healthHandler(sessionMgr session.Manager) gin.HandlerFunc {
 		c.JSON(200, gin.H{
 			"status":          "ok",
 			"version":         "0.1.0",
-			"uptime":          time.Since(startTime).String(),
+			"uptime_seconds":  int(time.Since(startTime).Seconds()),
 			"active_sessions": sessionMgr.ActiveCount(),
 		})
 	}
diff --git a/backend/internal/api/session.go b/backend/internal/api/session.go
new file mode 100644
index 0000000..135758b
--- /dev/null
+++ b/backend/internal/api/session.go
@@ -0,0 +1,91 @@
+// Package api 提供 REST API 处理函数。
+package api
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/hhs/camtalk/internal/models"
+	"github.com/hhs/camtalk/internal/session"
+)
+
+// SessionHandler 提供会话相关的 REST 端点。
+type SessionHandler struct {
+	sessionMgr session.Manager
+}
+
+// NewSessionHandler 创建 SessionHandler。
+func NewSessionHandler(sessionMgr session.Manager) *SessionHandler {
+	return &SessionHandler{sessionMgr: sessionMgr}
+}
+
+// CreateSessionRequest POST /api/sessions 请求体（所有字段可选）。
+type CreateSessionRequest struct {
+	Config *models.SessionConfig `json:"config,omitempty"`
+}
+
+// CreateSession POST /api/sessions — 创建新会话。
+func (h *SessionHandler) CreateSession(c *gin.Context) {
+	var req CreateSessionRequest
+	// 请求体可选，解析失败不报错（使用默认配置）
+	_ = c.ShouldBindJSON(&req)
+
+	cfg := models.DefaultConfig()
+	if req.Config != nil {
+		cfg = *req.Config
+	}
+
+	sessionID, err := h.sessionMgr.Create(c.Request.Context(), cfg)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"code":    "INTERNAL_ERROR",
+			"message": "failed to create session",
+		})
+		return
+	}
+
+	// 获取创建后的会话以返回 created_at
+	sess, err := h.sessionMgr.Get(c.Request.Context(), sessionID)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"code":    "INTERNAL_ERROR",
+			"message": "failed to retrieve created session",
+		})
+		return
+	}
+
+	c.JSON(http.StatusCreated, gin.H{
+		"session_id": sess.ID,
+		"created_at": sess.CreatedAt,
+	})
+}
+
+// DestroySession DELETE /api/sessions/:id — 销毁会话。
+func (h *SessionHandler) DestroySession(c *gin.Context) {
+	sessionID := c.Param("id")
+
+	err := h.sessionMgr.Destroy(c.Request.Context(), sessionID)
+	if err != nil {
+		if err == session.ErrSessionNotFound {
+			c.JSON(http.StatusNotFound, gin.H{
+				"code":    "SESSION_NOT_FOUND",
+				"message": "session not found or already expired",
+			})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{
+			"code":    "INTERNAL_ERROR",
+			"message": "failed to destroy session",
+		})
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}
+
+// RegisterRoutes 注册会话相关路由到给定的路由组。
+func (h *SessionHandler) RegisterRoutes(rg *gin.RouterGroup) {
+	rg.POST("/sessions", h.CreateSession)
+	rg.DELETE("/sessions/:id", h.DestroySession)
+}