diff --git a/etc/judge.yml b/etc/judge.yml
index e86f7d39..1df87c5a 100644
--- a/etc/judge.yml
+++ b/etc/judge.yml
@@ -6,6 +6,7 @@ query:
 redis:
   addrs: 
     - 127.0.0.1:6379
+  db: 0
   pass: ""
   # timeout:
   #   conn: 500
diff --git a/etc/monapi.yml b/etc/monapi.yml
index 030c3a46..ba7c2238 100644
--- a/etc/monapi.yml
+++ b/etc/monapi.yml
@@ -52,6 +52,7 @@ link:
 # for alarm event and message queue
 redis:
   addr: "127.0.0.1:6379"
+  db: 0
   pass: ""
   # in ms
   # timeout:
diff --git a/src/modules/judge/backend/redi/redis.go b/src/modules/judge/backend/redi/redis.go
index 8b167630..8957b8b2 100644
--- a/src/modules/judge/backend/redi/redis.go
+++ b/src/modules/judge/backend/redi/redis.go
@@ -15,6 +15,7 @@ var Config RedisSection
 type RedisSection struct {
 	Addrs   []string       `yaml:"addrs"`
 	Pass    string         `yaml:"pass"`
+	DB      int            `yaml:"db"`
 	Idle    int            `yaml:"idle"`
 	Timeout TimeoutSection `yaml:"timeout"`
 	Prefix  string         `yaml:"prefix"`
@@ -31,6 +32,7 @@ func Init(cfg RedisSection) {
 
 	addrs := cfg.Addrs
 	pass := cfg.Pass
+	db := cfg.DB
 	maxIdle := cfg.Idle
 	idleTimeout := 240 * time.Second
 
@@ -59,6 +61,15 @@ func Init(cfg RedisSection) {
 					}
 				}
 
+				if db != 0 {
+					if _, err := c.Do("SELECT", db); err != nil {
+						c.Close()
+						logger.Error("redis select db fail, db: ", db)
+						stats.Counter.Set("redis.conn.failed", 1)
+						return nil, err
+					}
+				}
+
 				return c, err
 			},
 			TestOnBorrow: PingRedis,
diff --git a/src/modules/monapi/config/yaml.go b/src/modules/monapi/config/yaml.go
index ad0e870a..1745c1f8 100644
--- a/src/modules/monapi/config/yaml.go
+++ b/src/modules/monapi/config/yaml.go
@@ -43,6 +43,7 @@ type cleanerSection struct {
 type redisSection struct {
 	Addr    string         `yaml:"addr"`
 	Pass    string         `yaml:"pass"`
+	DB      int            `yaml:"db"`
 	Idle    int            `yaml:"idle"`
 	Timeout timeoutSection `yaml:"timeout"`
 }
diff --git a/src/modules/monapi/redisc/redis.go b/src/modules/monapi/redisc/redis.go
index 576e3455..962a57f1 100644
--- a/src/modules/monapi/redisc/redis.go
+++ b/src/modules/monapi/redisc/redis.go
@@ -17,6 +17,7 @@ func InitRedis() {
 
 	addr := cfg.Redis.Addr
 	pass := cfg.Redis.Pass
+	db := cfg.Redis.DB
 	maxIdle := cfg.Redis.Idle
 	idleTimeout := 240 * time.Second
 
@@ -44,6 +45,15 @@ func InitRedis() {
 				}
 			}
 
+			if db != 0 {
+				if _, err := c.Do("SELECT", db); err != nil {
+					c.Close()
+					logger.Error("redis select db fail, db: ", db)
+					stats.Counter.Set("redis.conn.failed", 1)
+					return nil, err
+				}
+			}
+
 			return c, err
 		},
 		TestOnBorrow: PingRedis,