diff --git a/cache/relation.go b/cache/relation.go
index 2333dde..1bb8ff9 100644
--- a/cache/relation.go
+++ b/cache/relation.go
@@ -2,6 +2,7 @@ package cache
 
 import (
 	"electricity_bill_calc/global"
+	"fmt"
 	"strings"
 
 	"github.com/rueian/rueidis"
@@ -69,3 +70,52 @@ func AbolishRelation(relationName string) error {
 		return nil
 	}
 }
+
+func ClearOrphanRelationItems() error {
+	var (
+		err    error
+		cursor int64
+		keys   = make([]string, 0)
+		sKeys  []string
+	)
+	for {
+		scanCmd := global.RedisConn.B().Scan().Cursor(cursor).Match(fmt.Sprintf("%s:*", TAG_RELATION)).Count(20).Build()
+		results := global.RedisConn.Do(global.Ctx, scanCmd)
+		cursor, sKeys, err = dissembleScan(results)
+		if err != nil {
+			return err
+		}
+		keys = append(keys, sKeys...)
+		if cursor == 0 {
+			break
+		}
+	}
+	var cmds = make(rueidis.Commands, 0)
+	for _, key := range keys {
+		relationItemsCmd := global.RedisConn.B().Smembers().Key(key).Build()
+		results := global.RedisConn.Do(global.Ctx, relationItemsCmd)
+		relationItems, err := results.AsStrSlice()
+		if err != nil {
+			return err
+		}
+		for _, item := range relationItems {
+			exist, err := Exists(item)
+			if err != nil {
+				return err
+			}
+			if !exist {
+				cmd := global.RedisConn.B().Srem().Key(key).Member(item).Build()
+				cmds = append(cmds, cmd)
+			}
+		}
+	}
+	errs := global.RedisConn.DoMulti(global.Ctx, cmds...)
+	firstErr, has := lo.Find(errs, func(elem rueidis.RedisResult) bool {
+		return elem.Error() != nil
+	})
+	if has {
+		return firstErr.Error()
+	} else {
+		return nil
+	}
+}
diff --git a/main.go b/main.go
index e617cf8..2332316 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"electricity_bill_calc/cache"
 	"electricity_bill_calc/config"
 	"electricity_bill_calc/global"
 	"electricity_bill_calc/model"
@@ -157,8 +158,19 @@ func DBConnectionKeepLive() {
 	}
 }
 
+func RedisOrphanCleanup() {
+	for range time.Tick(2 * time.Minute) {
+		err := cache.ClearOrphanRelationItems()
+		if err != nil {
+			log.Printf("[Cache] [Cleanup] Orphan keys clear failed: %v", err)
+			continue
+		}
+	}
+}
+
 func main() {
 	go DBConnectionKeepLive()
+	go RedisOrphanCleanup()
 	gin.SetMode(config.ServerSettings.RunMode)
 	r := router.Router()
 	r.Run(fmt.Sprintf(":%d", config.ServerSettings.HttpPort))