diff --git a/src/main.go b/src/main.go
index 2035e39..6132ca7 100644
--- a/src/main.go
+++ b/src/main.go
@@ -122,6 +122,7 @@ func serverAPI(w http.ResponseWriter, r *http.Request) {
 			msg.Error = err.Error()
 		} else {
 			msg = InstanceOfGroupManager().Add(group)
+			scheduler.updateGroup(group)
 		}
 		js, _ := json.Marshal(msg)
 		w.Header().Set("Content-Type", "application/json")
@@ -138,6 +139,7 @@ func serverAPI(w http.ResponseWriter, r *http.Request) {
 			msg.Error = err.Error()
 		} else {
 			msg = InstanceOfGroupManager().Update(group)
+			scheduler.updateGroup(group)
 		}
 		js, _ := json.Marshal(msg)
 		w.Header().Set("Content-Type", "application/json")
@@ -154,6 +156,7 @@ func serverAPI(w http.ResponseWriter, r *http.Request) {
 			msg.Error = err.Error()
 		} else {
 			msg = InstanceOfGroupManager().Remove(group)
+			scheduler.updateGroup(group)
 		}
 		js, _ := json.Marshal(msg)
 		w.Header().Set("Content-Type", "application/json")
diff --git a/src/scheduler.go b/src/scheduler.go
index 085a4d2..c5a0269 100644
--- a/src/scheduler.go
+++ b/src/scheduler.go
@@ -38,4 +38,6 @@ type Scheduler interface {
 	SetShareRatio(ratio float64) bool
 
 	SetPreScheduleRatio(ratio float64) bool
+
+	updateGroup(group Group) bool
 }
diff --git a/src/scheduler_FCFS.go b/src/scheduler_FCFS.go
index 7e5ccc3..ed7fa91 100644
--- a/src/scheduler_FCFS.go
+++ b/src/scheduler_FCFS.go
@@ -273,3 +273,7 @@ func (scheduler *SchedulerFCFS) SetPreScheduleRatio(ratio float64) bool {
 	log.Info("enablePreScheduleRatio is updated to", ratio)
 	return true
 }
+
+func (scheduler *SchedulerFCFS) updateGroup(group Group) bool {
+	return true
+}
diff --git a/src/scheduler_fair.go b/src/scheduler_fair.go
index 7f3c767..6395201 100644
--- a/src/scheduler_fair.go
+++ b/src/scheduler_fair.go
@@ -40,6 +40,7 @@ type SchedulerFair struct {
 	allocatingGPU   int
 	allocatingGPUMu sync.Mutex
 
+	queuesUsingGPUMu sync.Mutex
 	queueUsingGPU       map[string]int
 	reservedGPU         int
 	queuesSchedulingCnt map[string]int
@@ -105,8 +106,17 @@ func (scheduler *SchedulerFair) Start() {
 				for _, task := range jm.job.Tasks {
 					cnt += task.NumberGPU
 				}
-				if scheduler.schedulingJobsCnt > 1 {
-					if (cnt+scheduler.allocatingGPU+1)*13 > (pool.TotalGPU-scheduler.UsingGPU-scheduler.reservedGPU)*10 {
+				reserved := scheduler.reservedGPU
+				scheduler.queuesUsingGPUMu.Lock()
+				for g, v := range scheduler.queueUsingGPU {
+					if InstanceOfGroupManager().groups[g].Reserved {
+						reserved -= v
+					}
+				}
+				scheduler.queuesUsingGPUMu.Unlock()
+
+				if scheduler.schedulingJobsCnt > 0 {
+					if (cnt+scheduler.allocatingGPU+1)*13 > (pool.TotalGPU-scheduler.UsingGPU-reserved)*10 {
 						scheduler.schedulingMu.Lock()
 						scheduler.schedulingJobsCnt--
 						scheduler.schedulingMu.Unlock()
@@ -163,9 +173,11 @@ func (scheduler *SchedulerFair) Start() {
 				}
 
 				available := InstanceOfGroupManager().groups[t[0].Group].NumGPU
+				scheduler.queuesUsingGPUMu.Lock()
 				if cnt, ok := scheduler.queueUsingGPU[t[0].Group]; ok {
 					available -= cnt
 				}
+				scheduler.queuesUsingGPUMu.Unlock()
 
 				if pool.TotalGPU-scheduler.UsingGPU-scheduler.allocatingGPU*13/10 < 0 {
 					continue
@@ -447,8 +459,6 @@ func (scheduler *SchedulerFair) AcquireResource(job Job, task Task, nodes []Node
 					if node.Status[j].MemoryAllocated == 0 {
 						scheduler.UsingGPUMu.Lock()
 						scheduler.UsingGPU ++
-						scheduler.queueUsingGPU[job.Group] += task.NumberGPU
-						scheduler.reservedGPU += task.NumberGPU
 						scheduler.UsingGPUMu.Unlock()
 					}
 					node.Status[j].MemoryAllocated += task.MemoryGPU
@@ -459,6 +469,11 @@ func (scheduler *SchedulerFair) AcquireResource(job Job, task Task, nodes []Node
 		for _, t := range res.Status {
 			scheduler.Attach(t.UUID, job.Name)
 		}
+
+		scheduler.queuesUsingGPUMu.Lock()
+		scheduler.queueUsingGPU[job.Group] += task.NumberGPU
+		scheduler.queuesUsingGPUMu.Unlock()
+
 		scheduler.allocatingGPUMu.Lock()
 		scheduler.allocatingGPU -= task.NumberGPU
 		scheduler.allocatingGPUMu.Unlock()
@@ -509,16 +524,6 @@ func (scheduler *SchedulerFair) ReleaseResource(job Job, agent NodeStatus) {
 				if node.Status[j].MemoryAllocated == 0 {
 					scheduler.UsingGPUMu.Lock()
 					scheduler.UsingGPU--
-					if _, ok := scheduler.queueUsingGPU[job.Group]; ok {
-						scheduler.queueUsingGPU[job.Group]--
-						scheduler.reservedGPU--
-						if scheduler.queueUsingGPU[job.Group] < 0 {
-							scheduler.queueUsingGPU[job.Group] = 0
-						}
-						if scheduler.reservedGPU < 0 {
-							scheduler.reservedGPU = 0
-						}
-					}
 					scheduler.UsingGPUMu.Unlock()
 					log.Info(node.Status[j].UUID, " is released")
 				}
@@ -526,6 +531,15 @@ func (scheduler *SchedulerFair) ReleaseResource(job Job, agent NodeStatus) {
 			}
 		}
 	}
+	scheduler.queuesUsingGPUMu.Lock()
+	if _, ok := scheduler.queueUsingGPU[job.Group]; ok {
+		scheduler.queueUsingGPU[job.Group] -= len(agent.Status)
+		if scheduler.queueUsingGPU[job.Group] < 0 {
+			log.Warn("queueUsingGPU exceeded ", scheduler.queueUsingGPU[job.Group])
+			scheduler.queueUsingGPU[job.Group] = 0
+		}
+	}
+	scheduler.queuesUsingGPUMu.Unlock()
 	go func(res NodeStatus) {
 		scheduler.resourceAllocationsMu.Lock()
 		if _, ok := scheduler.resourceAllocations[job.Group]; !ok {
@@ -740,3 +754,16 @@ func (scheduler *SchedulerFair) SetPreScheduleRatio(ratio float64) bool {
 	log.Info("enablePreScheduleRatio is updated to ", ratio)
 	return true
 }
+
+func (scheduler *SchedulerFair) updateGroup(group Group) bool {
+	num := 0
+	for _, g := range InstanceOfGroupManager().List().Groups {
+		if g.Reserved {
+			num += g.NumGPU
+		}
+	}
+	scheduler.queuesUsingGPUMu.Lock()
+	scheduler.reservedGPU = num
+	scheduler.queuesUsingGPUMu.Unlock()
+	return true
+}
diff --git a/src/scheduler_priority.go b/src/scheduler_priority.go
index faef69f..2858b4a 100644
--- a/src/scheduler_priority.go
+++ b/src/scheduler_priority.go
@@ -297,3 +297,7 @@ func (scheduler *SchedulerPriority) SetPreScheduleRatio(ratio float64) bool {
 	log.Info("enablePreScheduleRatio is updated to", ratio)
 	return true
 }
+
+func (scheduler *SchedulerPriority) updateGroup(group Group) bool {
+	return true
+}