diff --git a/backend/cmd/start.go b/backend/cmd/start.go
index 64e4c57..8830479 100644
--- a/backend/cmd/start.go
+++ b/backend/cmd/start.go
@@ -44,7 +44,7 @@ func Start() {
 	rdb := inits.InitRedis()
 	//工具包
 	limiter := pkg.NewRateLimiter(rdb)
-	//初始化agent
+	//初始化eino
 	aiHub, err := inits.InitEino()
 	if err != nil {
 		log.Fatalf("Failed to initialize Eino: %v", err)
@@ -53,6 +53,7 @@ func Start() {
 
 	//dao 层
 	cacheRepo := dao.NewCacheDAO(rdb)
+	agentCacheRepo := dao.NewAgentCache(rdb)
 	_ = db.Use(middleware.NewGormCachePlugin(cacheRepo)) // 注册 GORM 插件
 	userRepo := dao.NewUserDAO(db)
 	taskRepo := dao.NewTaskDAO(db)
@@ -67,7 +68,7 @@ func Start() {
 	courseService := service.NewCourseService(courseRepo, scheduleRepo)
 	taskClassService := service.NewTaskClassService(taskClassRepo, cacheRepo, scheduleRepo, manager)
 	scheduleService := service.NewScheduleService(scheduleRepo, userRepo, taskClassRepo, manager, cacheRepo)
-	agentService := service.NewAgentService(aiHub, agentRepo)
+	agentService := service.NewAgentService(aiHub, agentRepo, agentCacheRepo)
 	//api 层
 	userApi := api.NewUserHandler(userService)
 	taskApi := api.NewTaskHandler(taskSv)
diff --git a/backend/dao/agent-cache.go b/backend/dao/agent-cache.go
new file mode 100644
index 0000000..7c4a630
--- /dev/null
+++ b/backend/dao/agent-cache.go
@@ -0,0 +1,146 @@
+package dao
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/cloudwego/eino/schema"
+	"github.com/go-redis/redis/v8"
+)
+
+type AgentCache struct {
+	client *redis.Client
+	// 默认滑动窗口大小，比如 20 条消息
+	windowSize int
+	// 缓存过期时间
+	expiration time.Duration
+}
+
+func NewAgentCache(client *redis.Client) *AgentCache {
+	return &AgentCache{
+		client:     client,
+		windowSize: 20,            // 后续更新：根据 Token 消耗灵活调整
+		expiration: 1 * time.Hour, // 保持一小时的热记忆
+	}
+}
+
+func (m *AgentCache) PushMessage(ctx context.Context, sessionID string, msg *schema.Message) error {
+	key := fmt.Sprintf("smartflow:history:%s", sessionID)
+
+	// 1. 序列化 Eino 消息
+	data, err := json.Marshal(msg)
+	if err != nil {
+		return fmt.Errorf("marshal message failed: %w", err)
+	}
+
+	// 2. 利用 Pipeline 保证原子操作
+	pipe := m.client.Pipeline()
+
+	// 往左侧推入最新消息 (LIFO 逻辑)
+	pipe.LPush(ctx, key, data)
+
+	// 核心：强制修剪，只保留最新的 windowSize 条
+	// 0 是最新的一条，windowSize-1 是最后一条
+	pipe.LTrim(ctx, key, 0, int64(m.windowSize-1))
+
+	// 刷新过期时间
+	pipe.Expire(ctx, key, m.expiration)
+
+	_, err = pipe.Exec(ctx)
+	return err
+}
+
+func (m *AgentCache) GetHistory(ctx context.Context, sessionID string) ([]*schema.Message, error) {
+	key := fmt.Sprintf("smartflow:history:%s", sessionID)
+
+	// 获取所有缓存的消息
+	vals, err := m.client.LRange(ctx, key, 0, -1).Result()
+	if err != nil {
+		return nil, err
+	}
+
+	// 如果 Redis 为空，这里返回 nil 触发后续的 MySQL 捞取逻辑
+	if len(vals) == 0 {
+		return nil, nil
+	}
+
+	messages := make([]*schema.Message, len(vals))
+	for i, val := range vals {
+		var msg schema.Message
+		if err := json.Unmarshal([]byte(val), &msg); err != nil {
+			return nil, err
+		}
+
+		// 关键逻辑：反转顺序
+		// LRANGE 返回顺序：[MsgN, MsgN-1, ... Msg1]
+		// 我们需要的顺序：[Msg1, ... MsgN-1, MsgN]
+		messages[len(vals)-1-i] = &msg
+	}
+
+	return messages, nil
+}
+
+// BackfillHistory 用于缓存失效时，从数据库加载完数据后一次性回填 Redis
+func (m *AgentCache) BackfillHistory(ctx context.Context, sessionID string, messages []*schema.Message) error {
+	if len(messages) == 0 {
+		return nil
+	}
+
+	key := fmt.Sprintf("smartflow:history:%s", sessionID)
+
+	// 1. 将所有 Eino 消息序列化为 []interface{} 供 redis 批量写入
+	values := make([]interface{}, len(messages))
+	for i, msg := range messages {
+		data, err := json.Marshal(msg)
+		if err != nil {
+			return fmt.Errorf("marshal failed at index %d: %w", err)
+		}
+		values[i] = data
+	}
+
+	// 2. 执行原子回填
+	pipe := m.client.Pipeline()
+
+	// 先清理旧 Key（防止数据重复或残留）
+	pipe.Del(ctx, key)
+
+	// 批量写入：按照 [最旧 -> 最新] 的顺序 LPUSH
+	// 结果在 Redis 中：[最新, ..., 最旧] (符合我们 GetHistory 的反转逻辑)
+	pipe.LPush(ctx, key, values...)
+
+	// 依然要进行修剪，确保不超过窗口大小
+	pipe.LTrim(ctx, key, 0, int64(m.windowSize-1))
+
+	// 设置过期时间
+	pipe.Expire(ctx, key, m.expiration)
+
+	_, err := pipe.Exec(ctx)
+	return err
+}
+
+func (m *AgentCache) ClearHistory(ctx context.Context, sessionID string) error {
+	key := fmt.Sprintf("smartflow:history:%s", sessionID)
+	return m.client.Del(ctx, key).Err()
+}
+
+func (m *AgentCache) GetConversationStatus(ctx context.Context, sessionID string) (bool, error) {
+	key := fmt.Sprintf("smartflow:conversation_status:%s", sessionID)
+	n, err := m.client.Exists(ctx, key).Result()
+	if err != nil {
+		return false, err
+	}
+	return n == 1, nil
+}
+
+func (m *AgentCache) SetConversationStatus(ctx context.Context, sessionID string) error {
+	key := fmt.Sprintf("smartflow:conversation_status:%s", sessionID)
+	// 仅用于“存在性”标记：只有不存在时才写入，避免重复写
+	return m.client.SetNX(ctx, key, 1, m.expiration).Err()
+}
+
+func (m *AgentCache) DeleteConversationStatus(ctx context.Context, sessionID string) error {
+	key := fmt.Sprintf("smartflow:conversation_status:%s", sessionID)
+	return m.client.Del(ctx, key).Err()
+}
diff --git a/backend/service/agent.go b/backend/service/agent.go
index 2b23d53..b54d527 100644
--- a/backend/service/agent.go
+++ b/backend/service/agent.go
@@ -2,6 +2,7 @@ package service
 
 import (
 	"context"
+	"log"
 
 	"github.com/LoveLosita/smartflow/backend/agent"
 	"github.com/LoveLosita/smartflow/backend/conv"
@@ -11,14 +12,16 @@ import (
 )
 
 type AgentService struct {
-	AIHub *inits.AIHub
-	repo  *dao.AgentDAO
+	AIHub      *inits.AIHub
+	repo       *dao.AgentDAO
+	agentCache *dao.AgentCache
 }
 
-func NewAgentService(aiHub *inits.AIHub, repo *dao.AgentDAO) *AgentService {
+func NewAgentService(aiHub *inits.AIHub, repo *dao.AgentDAO, agentRedis *dao.AgentCache) *AgentService {
 	return &AgentService{
-		AIHub: aiHub,
-		repo:  repo,
+		AIHub:      aiHub,
+		repo:       repo,
+		agentCache: agentRedis,
 	}
 }
 
@@ -27,16 +30,47 @@ func (s *AgentService) AgentChat(ctx context.Context, userMessage string, ifThin
 	outChan := make(chan string, 5)
 	errChan := make(chan error, 1)
 	//2. 先确保这个会话存在（如果不存在就创建一个新的）
-	result, err := s.repo.IfChatExists(ctx, userID, chatID)
+	//先看看缓存里面有没有这个会话
+	result, err := s.agentCache.GetConversationStatus(ctx, chatID)
 	if err != nil {
 		errChan <- err
 		close(outChan)
 		close(errChan)
 		return outChan, errChan
 	}
+	//如果缓存里面没有，就去查库
+	if !result {
+		innerResult, err := s.repo.IfChatExists(ctx, userID, chatID)
+		if err != nil {
+			errChan <- err
+			close(outChan)
+			close(errChan)
+			return outChan, errChan
+		}
+		if !innerResult {
+			//如果会话不存在，先创建一个新的会话
+			_, err := s.repo.CreateNewChat(userID, chatID)
+			if err != nil {
+				errChan <- err
+				close(outChan)
+				close(errChan)
+				return outChan, errChan
+			}
+		}
+	}
+	//能走到这里，要么缓存里有这个会话，要么数据库里有这个会话了
+	//4. 提取出历史消息，构建上下文
+	//先尝试从缓存里拿历史消息
 	var chatHistory []*schema.Message
-	if result {
-		//4. 提取出历史消息，构建上下文
+	chatHistory, err = s.agentCache.GetHistory(ctx, chatID)
+	if err != nil {
+		errChan <- err
+		close(outChan)
+		close(errChan)
+		return outChan, errChan
+	}
+	//如果缓存里没有历史消息，就从数据库里拿
+	if chatHistory == nil {
 		//先从数据库拿到历史消息
 		histories, err := s.repo.GetUserChatHistories(ctx, userID, 20, chatID)
 		if err != nil {
@@ -47,9 +81,8 @@ func (s *AgentService) AgentChat(ctx context.Context, userMessage string, ifThin
 		}
 		//再转换成 Eino 的消息格式
 		chatHistory = conv.ToEinoMessages(histories)
-	} else {
-		//如果会话不存在，先创建一个新的会话
-		_, err := s.repo.CreateNewChat(userID, chatID)
+		//把历史消息放到缓存里，方便下次直接拿
+		err = s.agentCache.BackfillHistory(ctx, chatID, chatHistory)
 		if err != nil {
 			errChan <- err
 			close(outChan)
@@ -57,14 +90,16 @@ func (s *AgentService) AgentChat(ctx context.Context, userMessage string, ifThin
 			return outChan, errChan
 		}
 	}
-	//3. 将用户消息落库
-	err = s.repo.SaveChatHistory(ctx, userID, chatID, "user", userMessage)
-	if err != nil {
-		errChan <- err
-		close(outChan)
-		close(errChan)
-		return outChan, errChan
-	}
+	//3. 将用户消息异步落缓存和库
+	go func() {
+		//这里先不管落库成功与否了，毕竟不想因为落库失败而影响用户的聊天体验
+		_ = s.agentCache.PushMessage(ctx, chatID, &schema.Message{
+			Role:    "user",
+			Content: userMessage,
+		})
+		_ = s.repo.SaveChatHistory(ctx, userID, chatID, "user", userMessage)
+	}()
+
 	//5. 启动一个 goroutine 来处理聊天逻辑
 	go func() {
 		defer close(outChan) // 确保在函数结束时关闭通道
@@ -74,15 +109,18 @@ func (s *AgentService) AgentChat(ctx context.Context, userMessage string, ifThin
 			errChan <- err
 			return
 		}
-		err = s.repo.SaveChatHistory(ctx, userID, chatID, "assistant", fullText)
-		if err != nil {
-			errChan <- err
-			return
-		}
+		//4. 将 AI 的回复异步落缓存和库
+		go func() {
+			_ = s.agentCache.PushMessage(ctx, chatID, &schema.Message{
+				Role:    "assistant",
+				Content: fullText,
+			})
+			err = s.repo.SaveChatHistory(context.Background(), userID, chatID, "assistant", fullText)
+			if err != nil {
+				log.Printf("Failed to save chat history to database: %v", err)
+				return
+			}
+		}()
 	}()
 	return outChan, errChan
 }
-
-func (s *AgentService) CreateNewChat(userID int, chatID string) (int64, error) {
-	return s.repo.CreateNewChat(userID, chatID)
-}