diff --git a/cache/abstract.go b/cache/abstract.go
index f8ae8ef..dc8cb9a 100644
--- a/cache/abstract.go
+++ b/cache/abstract.go
@@ -2,6 +2,8 @@ package cache
 
 import (
 	"electricity_bill_calc/global"
+	"fmt"
+	"strings"
 	"time"
 
 	"github.com/go-redis/redis/v8"
@@ -56,3 +58,13 @@ func Delete(key string) (bool, error) {
 	}
 	return result > 0, nil
 }
+
+// 生成用于Redis存储的键
+func CacheKey(category string, ids ...string) string {
+	var b strings.Builder
+	b.WriteString(category)
+	for _, s := range ids {
+		fmt.Fprintf(&b, ":%s", s)
+	}
+	return b.String()
+}
diff --git a/cache/session.go b/cache/session.go
index a656c09..4e4b179 100644
--- a/cache/session.go
+++ b/cache/session.go
@@ -3,25 +3,35 @@ package cache
 import (
 	"electricity_bill_calc/model"
 	"fmt"
+	"strings"
 	"time"
 )
 
+func SessionKey(keys ...string) string {
+	var b strings.Builder
+	b.WriteString("session")
+	for _, s := range keys {
+		fmt.Fprintf(&b, ":%s", s)
+	}
+	return b.String()
+}
+
 func CacheSession(session *model.Session) error {
-	key := fmt.Sprintf("session:%s", session.Token)
+	key := SessionKey(session.Token)
 	return Cache(key, session, 2*time.Hour)
 }
 
 func RetreiveSession(token string) (*model.Session, error) {
-	key := fmt.Sprintf("session:%s", token)
+	key := SessionKey(token)
 	return Retreive[model.Session](key)
 }
 
 func HasSession(token string) (bool, error) {
-	key := fmt.Sprintf("session:%s", token)
+	key := SessionKey(token)
 	return Exists(key)
 }
 
 func ClearSession(token string) (bool, error) {
-	key := fmt.Sprintf("session:%s", token)
+	key := SessionKey(token)
 	return Delete(key)
 }