diff --git a/api/v1/plant/ai_chat_api.go b/api/v1/plant/ai_chat_api.go
index 777a022..96e586a 100644
--- a/api/v1/plant/ai_chat_api.go
+++ b/api/v1/plant/ai_chat_api.go
@@ -1,6 +1,7 @@
 package plant
 
 import (
+	"fmt"
 	"sundynix-go/global"
 	"sundynix-go/model/commom/response"
 	"sundynix-go/utils/auth"
@@ -24,7 +25,19 @@ func (a *AiChatApi) ChatStreamPlant(c *gin.Context) {
 		return
 	}
 
-	// SSE Headers（微信小程序通过 enableChunked: true 配合实现打字机效果）
+	userId := auth.GetUserId(c)
+
+	// ── 每日用量检查 ──
+	cfg, cfgErr := sysAiConfigService.GetActiveAiConfig()
+	if cfgErr == nil && cfg.DailyQueryLimit > 0 {
+		todayCount, _ := chatHistoryService.GetTodayCount(userId)
+		if todayCount >= int64(cfg.DailyQueryLimit) {
+			response.FailWithMsg(fmt.Sprintf("今日问答次数已达上限（%d次），明天再来吧", cfg.DailyQueryLimit), c)
+			return
+		}
+	}
+
+	// SSE Headers
 	w := c.Writer
 	header := w.Header()
 	header.Set("Content-Type", "text/event-stream")
@@ -46,14 +59,12 @@ func (a *AiChatApi) ChatStreamPlant(c *gin.Context) {
 		_, _ = w.WriteString("data: [ERROR]" + err.Error() + "\n\n")
 		w.Flush()
 	} else {
-		// 流结束标志
 		_, _ = w.WriteString("data: [DONE]\n\n")
 		w.Flush()
 	}
 
 	// 异步保存问答历史
 	if fullAnswer != "" {
-		userId := auth.GetUserId(c)
 		go func() {
 			if saveErr := chatHistoryService.SaveHistory(userId, query, fullAnswer); saveErr != nil {
 				global.Logger.Error("Save chat history failed", zap.Error(saveErr))
@@ -138,6 +149,34 @@ func (a *AiChatApi) ClearChatHistory(c *gin.Context) {
 	response.OkWithMsg("已清空", c)
 }
 
+// GetChatQuota 获取当前用户今日剩余问答额度
+// @Tags Plant-AiChat
+// @Router /plant/chat/quota [get]
+func (a *AiChatApi) GetChatQuota(c *gin.Context) {
+	userId := auth.GetUserId(c)
+	todayCount, _ := chatHistoryService.GetTodayCount(userId)
+
+	limit := 0 // 0 = unlimited
+	cfg, err := sysAiConfigService.GetActiveAiConfig()
+	if err == nil && cfg.DailyQueryLimit > 0 {
+		limit = cfg.DailyQueryLimit
+	}
+
+	remaining := -1 // -1 means unlimited
+	if limit > 0 {
+		remaining = limit - int(todayCount)
+		if remaining < 0 {
+			remaining = 0
+		}
+	}
+
+	response.OkWithData(map[string]interface{}{
+		"used":      todayCount,
+		"limit":     limit,
+		"remaining": remaining,
+	}, c)
+}
+
 func parseInt(s string) int {
 	n := 0
 	for _, c := range s {
diff --git a/api/v1/plant/enter.go b/api/v1/plant/enter.go
index 2224a84..28ca710 100644
--- a/api/v1/plant/enter.go
+++ b/api/v1/plant/enter.go
@@ -31,4 +31,5 @@ var (
 	exchangeService    = service.GroupApp.PlantServiceGroup.ExchangeService
 	aiRagService       = service.GroupApp.PlantServiceGroup.AiRagService
 	chatHistoryService = service.GroupApp.PlantServiceGroup.AiChatHistoryService
+	sysAiConfigService = service.GroupApp.SystemServiceGroup.SysAiConfigService
 )
diff --git a/model/system/sys_ai_config.go b/model/system/sys_ai_config.go
index c27a02b..4fa2ab9 100644
--- a/model/system/sys_ai_config.go
+++ b/model/system/sys_ai_config.go
@@ -20,4 +20,6 @@ type SysAiConfig struct {
 	EmbeddingApiUrl    string `gorm:"column:embedding_api_url;type:varchar(255);comment:Embedding模型接口地址" json:"embeddingApiUrl" form:"embeddingApiUrl"`
 	EmbeddingApiKey    string `gorm:"column:embedding_api_key;type:varchar(255);comment:Embedding模型ApiKey" json:"embeddingApiKey" form:"embeddingApiKey"`
 	EmbeddingModelName string `gorm:"column:embedding_model_name;type:varchar(100);comment:Embedding模型名称" json:"embeddingModelName" form:"embeddingModelName"`
+	// 用量限制
+	DailyQueryLimit int `gorm:"column:daily_query_limit;type:int;default:20;comment:每用户每日问答上限(0=不限)" json:"dailyQueryLimit" form:"dailyQueryLimit"`
 }
diff --git a/router/plant/ai_chat_router.go b/router/plant/ai_chat_router.go
index 1554c01..dc8647e 100644
--- a/router/plant/ai_chat_router.go
+++ b/router/plant/ai_chat_router.go
@@ -13,6 +13,7 @@ func (s *AiChatRouter) InitAiChatRouter(Router *gin.RouterGroup) (R gin.IRoutes)
 		aiChatRouter.GET("history", aiChatApi.GetChatHistory)            // 问答历史列表
 		aiChatRouter.POST("history/delete", aiChatApi.DeleteChatHistory) // 删除单条
 		aiChatRouter.POST("history/clear", aiChatApi.ClearChatHistory)   // 清空历史
+		aiChatRouter.GET("quota", aiChatApi.GetChatQuota)                // 今日剩余额度
 	}
 	return aiChatRouter
 }
diff --git a/router/system/sys_ai_config_router.go b/router/system/sys_ai_config_router.go
index b403165..bc6b7fe 100644
--- a/router/system/sys_ai_config_router.go
+++ b/router/system/sys_ai_config_router.go
@@ -9,7 +9,7 @@ func (s *SysAiConfigRouter) InitSysAiConfigRouter(Router *gin.RouterGroup) (R gi
 	sysAiConfigApi := sysAiConfigApi
 	{
 		sysAiConfigRouter.POST("create", sysAiConfigApi.CreateAiConfig) // 创建配置
-		sysAiConfigRouter.PUT("update", sysAiConfigApi.UpdateAiConfig)  // 更新配置
+		sysAiConfigRouter.POST("update", sysAiConfigApi.UpdateAiConfig) // 更新配置
 		sysAiConfigRouter.POST("setActive", sysAiConfigApi.SetActive)   // 设置激活状态
 		sysAiConfigRouter.GET("list", sysAiConfigApi.GetList)           // 获取列表
 	}
diff --git a/service/plant/ai_chat_history_service.go b/service/plant/ai_chat_history_service.go
index ed1360f..809dac2 100644
--- a/service/plant/ai_chat_history_service.go
+++ b/service/plant/ai_chat_history_service.go
@@ -46,3 +46,12 @@ func (s *AiChatHistoryService) DeleteHistory(userId, id string) error {
 func (s *AiChatHistoryService) ClearHistory(userId string) error {
 	return global.DB.Where("user_id = ?", userId).Delete(&plantModel.AiChatHistory{}).Error
 }
+
+// GetTodayCount 获取用户今日问答数量
+func (s *AiChatHistoryService) GetTodayCount(userId string) (int64, error) {
+	var count int64
+	err := global.DB.Model(&plantModel.AiChatHistory{}).
+		Where("user_id = ? AND DATE(created_at) = CURDATE()", userId).
+		Count(&count).Error
+	return count, err
+}