diff --git a/src/group.go b/src/group.go
new file mode 100644
index 0000000..47de5d2
--- /dev/null
+++ b/src/group.go
@@ -0,0 +1,61 @@
+package main
+
+import "sync"
+
+type GroupManager struct {
+	groups map[string]Group
+	mu     sync.Mutex
+}
+
+var groupManagerInstance *GroupManager
+var groupManagerInstanceLock sync.Mutex
+
+func InstanceOfGroupManager() *GroupManager {
+	defer groupManagerInstanceLock.Lock()
+	groupManagerInstanceLock.Lock()
+
+	if groupManagerInstance == nil {
+		groupManagerInstance = &GroupManager{groups: map[string]Group{}}
+	}
+	return groupManagerInstance
+}
+
+func (gm *GroupManager) Add(group Group) MsgGroupCreate {
+	defer gm.mu.Unlock()
+	if _, ok := gm.groups[group.Name]; ok {
+		return MsgGroupCreate{Code: 1, Error: "Name already exists!"}
+	}
+	gm.groups[group.Name] = group
+	gm.mu.Lock()
+	return MsgGroupCreate{}
+}
+
+func (gm *GroupManager) Update(group Group) MsgGroupCreate {
+	defer gm.mu.Unlock()
+	if _, ok := gm.groups[group.Name]; !ok {
+		return MsgGroupCreate{Code: 1, Error: "Group not exists!"}
+	}
+	gm.groups[group.Name] = group
+	gm.mu.Lock()
+	return MsgGroupCreate{}
+}
+
+func (gm *GroupManager) Remove(group Group) MsgGroupCreate {
+	defer gm.mu.Unlock()
+	if _, ok := gm.groups[group.Name]; !ok {
+		return MsgGroupCreate{Code: 1, Error: "Group not exists!"}
+	}
+	delete(gm.groups, group.Name)
+	gm.mu.Lock()
+	return MsgGroupCreate{}
+}
+
+func (gm *GroupManager) List() MsgGroupList {
+	defer gm.mu.Unlock()
+	var result []Group
+	for _, v := range gm.groups {
+		result = append(result, v)
+	}
+	gm.mu.Lock()
+	return MsgGroupList{Groups: result}
+}
diff --git a/src/scheduler_fair.go b/src/scheduler_fair.go
new file mode 100644
index 0000000..19a4565
--- /dev/null
+++ b/src/scheduler_fair.go
@@ -0,0 +1,246 @@
+package main
+
+import (
+	"sync"
+	"time"
+	log "github.com/sirupsen/logrus"
+)
+
+type SchedulerFair struct {
+	history    []*Job
+	queue      []Job
+	mu         sync.Mutex
+	scheduling sync.Mutex
+
+	jobs map[string]*JobManager
+}
+
+func (scheduler *SchedulerFair) Start() {
+	scheduler.jobs = map[string]*JobManager{}
+	scheduler.history = []*Job{}
+
+	go func() {
+		for {
+			log.Info("Scheduling")
+			time.Sleep(time.Second * 5)
+			scheduler.scheduling.Lock()
+			scheduler.mu.Lock()
+			if len(scheduler.queue) > 0 {
+
+				jm := JobManager{}
+				jm.job = scheduler.queue[0]
+
+				scheduler.queue = scheduler.queue[1:]
+				jm.scheduler = scheduler
+				scheduler.jobs[jm.job.Name] = &jm
+
+				jm.job.Status = Starting
+				scheduler.history = append(scheduler.history, &jm.job)
+
+				go func() {
+					jm.start()
+				}()
+			} else {
+				scheduler.scheduling.Unlock()
+			}
+			scheduler.mu.Unlock()
+		}
+	}()
+}
+
+func (scheduler *SchedulerFair) UpdateProgress(jobName string, state State) {
+	switch state {
+	case Running:
+		scheduler.scheduling.Unlock()
+
+		for i := range scheduler.history {
+			if scheduler.history[i].Name == jobName {
+				scheduler.history[i].Status = Running
+			}
+		}
+		break
+	case Finished:
+		for i := range scheduler.history {
+			if scheduler.history[i].Name == jobName {
+				scheduler.history[i].Status = Finished
+			}
+		}
+		break
+	case Stopped:
+		for i := range scheduler.history {
+			if scheduler.history[i].Name == jobName {
+				scheduler.history[i].Status = Stopped
+			}
+		}
+		break
+	}
+}
+
+func (scheduler *SchedulerFair) Schedule(job Job) {
+	scheduler.mu.Lock()
+	defer scheduler.mu.Unlock()
+
+	index := 0
+
+	left := 0
+	right := len(scheduler.queue) - 1
+	for ; left <= right; {
+		mid := (left + right) / 2
+		if scheduler.queue[left].Priority < job.Priority {
+			index = left
+			break
+		}
+		if scheduler.queue[right].Priority >= job.Priority {
+			index = right + 1
+			break
+		}
+		if scheduler.queue[mid].Priority >= job.Priority {
+			left = mid + 1
+		} else {
+			right = mid - 1
+		}
+	}
+	scheduler.queue = append(scheduler.queue, Job{})
+
+	copy(scheduler.queue[index+1:], scheduler.queue[index:])
+	scheduler.queue[index] = job
+
+	job.Status = Created
+}
+
+func (scheduler *SchedulerFair) AcquireResource(task Task) NodeStatus {
+	pool.mu.Lock()
+	defer pool.mu.Unlock()
+
+	res := NodeStatus{}
+	for id, node := range pool.nodes {
+		var available []GPUStatus
+		for _, status := range node.Status {
+			if status.MemoryTotal-status.MemoryAllocated >= task.MemoryGPU {
+				available = append(available, status)
+			}
+		}
+		if len(available) >= task.NumberGPU {
+			res.ClientID = id
+			res.ClientHost = node.ClientHost
+			res.Status = available[0:task.NumberGPU]
+
+			for i := range res.Status {
+				for j := range node.Status {
+					if res.Status[i].UUID == node.Status[j].UUID {
+						node.Status[j].MemoryAllocated += task.MemoryGPU
+						res.Status[i].MemoryTotal = task.MemoryGPU
+					}
+				}
+			}
+			break
+		}
+	}
+	return res
+}
+
+func (scheduler *SchedulerFair) ReleaseResource(agent NodeStatus) {
+	pool.mu.Lock()
+	defer pool.mu.Unlock()
+	nodes := pool.nodes[agent.ClientID]
+	for _, gpu := range agent.Status {
+		for j := range nodes.Status {
+			if gpu.UUID == nodes.Status[j].UUID {
+				nodes.Status[j].MemoryAllocated -= gpu.MemoryTotal
+			}
+		}
+	}
+}
+
+func (scheduler *SchedulerFair) QueryState(jobName string) MsgJobStatus {
+	jm, ok := scheduler.jobs[jobName]
+	if !ok {
+		return MsgJobStatus{Code: 1, Error: "Job not exist!"}
+	}
+	return jm.status()
+}
+
+func (scheduler *SchedulerFair) Stop(jobName string) MsgStop {
+	jm, ok := scheduler.jobs[jobName]
+	if !ok {
+		return MsgStop{Code: 1, Error: "Job not exist!"}
+	}
+	return jm.stop()
+}
+
+func (scheduler *SchedulerFair) QueryLogs(jobName string, taskName string) MsgLog {
+	jm, ok := scheduler.jobs[jobName]
+	if !ok {
+		return MsgLog{Code: 1, Error: "Job not exist!"}
+	}
+	return jm.logs(taskName)
+}
+
+func (scheduler *SchedulerFair) ListJobs() MsgJobList {
+	var tmp []Job
+	for _, job := range scheduler.history {
+		tmp = append(tmp, *job)
+	}
+	tmp = append(tmp, scheduler.queue...)
+	return MsgJobList{Code: 0, Jobs: tmp}
+}
+
+func (scheduler *SchedulerFair) Summary() MsgSummary {
+	summary := MsgSummary{}
+	summary.Code = 0
+
+	finishedJobsCounter := 0
+	runningJobsCounter := 0
+	pendingJobsCounter := 0
+
+	var tmp []Job
+	for _, job := range scheduler.history {
+		tmp = append(tmp, *job)
+	}
+	tmp = append(tmp, scheduler.queue...)
+
+	for _, job := range tmp {
+		switch job.Status {
+		case Created:
+			pendingJobsCounter++
+		case Starting:
+			pendingJobsCounter++
+			break
+		case Running:
+			runningJobsCounter++
+			break;
+		case Finished:
+			finishedJobsCounter++
+		case Stopped:
+			finishedJobsCounter++
+		}
+	}
+	summary.JobsFinished = finishedJobsCounter
+	summary.JobsPending = pendingJobsCounter
+	summary.JobsRunning = runningJobsCounter
+
+	FreeGPU := 0
+	UsingGPU := 0
+
+	for _, node := range pool.nodes {
+		for j := range node.Status {
+			if node.Status[j].MemoryAllocated == 0 {
+				FreeGPU++
+			} else {
+				UsingGPU++
+			}
+		}
+	}
+	summary.FreeGPU = FreeGPU
+	summary.UsingGPU = UsingGPU
+
+	return summary
+}
+
+func (scheduler *SchedulerFair) AcquireNetwork() string {
+	return pool.acquireNetwork()
+}
+
+func (scheduler *SchedulerFair) ReleaseNetwork(network string) {
+	pool.releaseNetwork(network)
+}