diff --git a/internal/handler/conversation.go b/internal/handler/conversation.go
index 06d04888..7715a698 100644
--- a/internal/handler/conversation.go
+++ b/internal/handler/conversation.go
@@ -103,6 +103,7 @@ func (h *ConversationHandler) ListConversations(c *gin.Context) {
 	limitStr := c.DefaultQuery("limit", "50")
 	offsetStr := c.DefaultQuery("offset", "0")
 	search := c.Query("search") // 获取搜索参数
+	projectID := strings.TrimSpace(c.Query("project_id"))
 
 	limit, _ := strconv.Atoi(limitStr)
 	offset, _ := strconv.Atoi(offsetStr)
@@ -114,7 +115,7 @@ func (h *ConversationHandler) ListConversations(c *gin.Context) {
 		limit = 1000
 	}
 
-	excludeGrouped := strings.TrimSpace(search) == "" &&
+	excludeGrouped := strings.TrimSpace(search) == "" && projectID == "" &&
 		(c.Query("exclude_grouped") == "true" || c.Query("exclude_grouped") == "1")
 	sortBy := strings.TrimSpace(c.Query("sort_by"))
 
@@ -122,14 +123,14 @@ func (h *ConversationHandler) ListConversations(c *gin.Context) {
 	var total int
 	var err error
 	if excludeGrouped {
-		conversations, err = h.db.ListUngroupedConversations(limit, offset, sortBy)
+		conversations, err = h.db.ListUngroupedConversations(limit, offset, sortBy, projectID)
 		if err == nil {
-			total, err = h.db.CountUngroupedConversations()
+			total, err = h.db.CountUngroupedConversations(projectID)
 		}
 	} else {
-		conversations, err = h.db.ListConversations(limit, offset, search, sortBy)
+		conversations, err = h.db.ListConversations(limit, offset, search, sortBy, projectID)
 		if err == nil {
-			total, err = h.db.CountConversations(search)
+			total, err = h.db.CountConversations(search, projectID)
 		}
 	}
 	if err != nil {
diff --git a/internal/handler/openapi.go b/internal/handler/openapi.go
index e14444d5..d25d06ae 100644
--- a/internal/handler/openapi.go
+++ b/internal/handler/openapi.go
@@ -1243,6 +1243,34 @@ func (h *OpenAPIHandler) GetOpenAPISpec(c *gin.Context) {
 								"type": "string",
 							},
 						},
+						{
+							"name":        "project_id",
+							"in":          "query",
+							"required":    false,
+							"description": "按项目筛选；传 __none__ 表示仅未绑定项目的对话",
+							"schema": map[string]interface{}{
+								"type": "string",
+							},
+						},
+						{
+							"name":        "exclude_grouped",
+							"in":          "query",
+							"required":    false,
+							"description": "为 true 时排除已加入分组的对话（默认在未搜索且未按项目筛选时启用）",
+							"schema": map[string]interface{}{
+								"type": "boolean",
+							},
+						},
+						{
+							"name":        "sort_by",
+							"in":          "query",
+							"required":    false,
+							"description": "排序字段：updated_at（默认）或 created_at",
+							"schema": map[string]interface{}{
+								"type": "string",
+								"enum": []string{"updated_at", "created_at"},
+							},
+						},
 					},
 					"responses": map[string]interface{}{
 						"200": map[string]interface{}{
diff --git a/internal/handler/robot.go b/internal/handler/robot.go
index 0c301506..0a703367 100644
--- a/internal/handler/robot.go
+++ b/internal/handler/robot.go
@@ -447,7 +447,7 @@ func (h *RobotHandler) cmdUnbindProject(platform, userID string) string {
 }
 
 func (h *RobotHandler) cmdList() string {
-	convs, err := h.db.ListConversations(50, 0, "", "")
+	convs, err := h.db.ListConversations(50, 0, "", "", "")
 	if err != nil {
 		return "获取对话列表失败: " + err.Error()
 	}