diff --git a/engine_group.go b/engine_group.go
index dd1e6380..8b8118be 100644
--- a/engine_group.go
+++ b/engine_group.go
@@ -73,6 +73,9 @@ func (eg *EngineGroup) Slave() *Engine {
 	case 1:
 		return eg.slaves[0]
 	}
+	if eg.s_count == 1 {
+		return eg.slaves[0]
+	}
 	return eg.policy.Slave(eg)
 }
 
diff --git a/engine_group_policy.go b/engine_group_policy.go
index 88412eaf..c4fdcb0d 100644
--- a/engine_group_policy.go
+++ b/engine_group_policy.go
@@ -71,7 +71,7 @@ func (policy *RoundRobinPolicy) Slave(g *EngineGroup) *Engine {
 	var pos int
 	policy.lock.Lock()
 	policy.pos++
-	if policy.pos >= len(g.Slaves()) {
+	if policy.pos >= g.s_count {
 		policy.pos = 0
 	}
 	pos = policy.pos
@@ -130,6 +130,18 @@ func NewLeastConnPolicy() *LeastConnPolicy {
 }
 
 func (policy *LeastConnPolicy) Slave(g *EngineGroup) *Engine {
-	panic("not implementation")
-	return nil
+	var slaves = g.Slaves()
+	connections := 0
+	idx := 0
+	for i, _ := range slaves {
+		open_connections := slaves[i].Stats()
+		if i == 0 {
+			connections = open_connections
+			idx = i
+		} else if open_connections <= connections {
+			connections = open_connections
+			idx = i
+		}
+	}
+	return slaves[idx]
 }