diff --git a/Makefile b/Makefile
index 9cc2c6b7..0aaa7a6a 100644
--- a/Makefile
+++ b/Makefile
@@ -82,7 +82,7 @@ project3b:
 	$(GOTEST) ./kv/test_raftstore -run 3B
 
 project3c:
-	$(GOTEST) ./scheduler/... -run 3C
+	$(GOTEST) ./scheduler/server ./scheduler/server/schedulers -check.f="3C"
 
 project4: project4a project4b project4c
 
diff --git a/scheduler/server/server.go b/scheduler/server/server.go
index 440686ad..5cbb1113 100644
--- a/scheduler/server/server.go
+++ b/scheduler/server/server.go
@@ -297,10 +297,6 @@ func (s *Server) IsClosed() bool {
 
 // Run runs the pd server.
 func (s *Server) Run(ctx context.Context) error {
-	go StartMonitor(ctx, time.Now, func() {
-		log.Error("system time jumps backward")
-	})
-
 	if err := s.startEtcd(ctx); err != nil {
 		return err
 	}
diff --git a/scheduler/server/systime_mon.go b/scheduler/server/systime_mon.go
deleted file mode 100644
index db39fed2..00000000
--- a/scheduler/server/systime_mon.go
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright 2017 PingCAP, Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package server
-
-import (
-	"context"
-	"time"
-
-	"github.com/pingcap/log"
-	"go.uber.org/zap"
-)
-
-// StartMonitor calls systimeErrHandler if system time jump backward.
-func StartMonitor(ctx context.Context, now func() time.Time, systimeErrHandler func()) {
-	log.Info("start system time monitor")
-	tick := time.NewTicker(100 * time.Millisecond)
-	defer tick.Stop()
-	for {
-		last := now().UnixNano()
-		select {
-		case <-tick.C:
-			if now().UnixNano() < last {
-				log.Error("system time jump backward", zap.Int64("last", last))
-				systimeErrHandler()
-			}
-		case <-ctx.Done():
-			return
-		}
-	}
-}
diff --git a/scheduler/server/systime_mon_test.go b/scheduler/server/systime_mon_test.go
deleted file mode 100644
index 4bab0edd..00000000
--- a/scheduler/server/systime_mon_test.go
+++ /dev/null
@@ -1,46 +0,0 @@
-// Copyright 2017 PingCAP, Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package server
-
-import (
-	"context"
-	"sync/atomic"
-	"testing"
-	"time"
-)
-
-func TestSystimeMonitor(t *testing.T) {
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-	var jumpForward int32
-
-	trigged := false
-	go StartMonitor(ctx,
-		func() time.Time {
-			if !trigged {
-				trigged = true
-				return time.Now()
-			}
-
-			return time.Now().Add(-2 * time.Second)
-		}, func() {
-			atomic.StoreInt32(&jumpForward, 1)
-		})
-
-	time.Sleep(1 * time.Second)
-
-	if atomic.LoadInt32(&jumpForward) != 1 {
-		t.Error("should detect time error")
-	}
-}