diff --git a/bench_test.go b/bench_test.go
index 1d481a542498a..f90f52aca9170 100644
--- a/bench_test.go
+++ b/bench_test.go
@@ -6,7 +6,6 @@ import (
 
 	"github.com/ngaut/log"
 	"github.com/pingcap/tidb/ast"
-	"github.com/pingcap/tidb/plan"
 )
 
 var smallCount = 100
@@ -218,22 +217,6 @@ func BenchmarkJoin(b *testing.B) {
 	}
 }
 
-func BenchmarkNewJoin(b *testing.B) {
-	b.StopTimer()
-	se := prepareBenchSession()
-	prepareJoinBenchData(se, "int", "%v", smallCount)
-	b.StartTimer()
-	plan.UseNewPlanner = true
-	for i := 0; i < b.N; i++ {
-		rs, err := se.Execute("select * from t a join t b on a.col = b.col")
-		if err != nil {
-			b.Fatal(err)
-		}
-		readResult(rs[0], 100)
-	}
-	plan.UseNewPlanner = false
-}
-
 func BenchmarkJoinLimit(b *testing.B) {
 	b.StopTimer()
 	se := prepareBenchSession()
@@ -247,19 +230,3 @@ func BenchmarkJoinLimit(b *testing.B) {
 		readResult(rs[0], 1)
 	}
 }
-
-func BenchmarkNewJoinLimit(b *testing.B) {
-	b.StopTimer()
-	se := prepareBenchSession()
-	prepareJoinBenchData(se, "int", "%v", smallCount)
-	b.StartTimer()
-	plan.UseNewPlanner = true
-	for i := 0; i < b.N; i++ {
-		rs, err := se.Execute("select * from t a join t b on a.col = b.col limit 1")
-		if err != nil {
-			b.Fatal(err)
-		}
-		readResult(rs[0], 1)
-	}
-	plan.UseNewPlanner = false
-}
diff --git a/executor/adapter.go b/executor/adapter.go
index f6eae3bae3bc0..9c7e65320775f 100644
--- a/executor/adapter.go
+++ b/executor/adapter.go
@@ -31,7 +31,7 @@ type recordSet struct {
 }
 
 func (a *recordSet) Fields() ([]*ast.ResultField, error) {
-	if plan.UseNewPlanner && len(a.fields) == 0 {
+	if len(a.fields) == 0 {
 		for _, col := range a.schema {
 			rf := &ast.ResultField{
 				ColumnAsName: col.ColName,
diff --git a/executor/executor_write.go b/executor/executor_write.go
index ec607979e68fb..82c26fa5f0758 100644
--- a/executor/executor_write.go
+++ b/executor/executor_write.go
@@ -22,7 +22,6 @@ import (
 	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/model"
 	"github.com/pingcap/tidb/mysql"
-	"github.com/pingcap/tidb/plan"
 	"github.com/pingcap/tidb/sessionctx/variable"
 	"github.com/pingcap/tidb/table"
 	"github.com/pingcap/tidb/terror"
@@ -305,19 +304,12 @@ func (e *DeleteExec) Next() (*Row, error) {
 	tblNames := make(map[string]string)
 	if e.IsMultiTable {
 		// Delete from multiple tables should consider table ident list.
-		if !plan.UseNewPlanner {
-			fs := e.SelectExec.Fields()
-			for _, f := range fs {
-				if len(f.TableAsName.L) > 0 {
-					tblNames[f.TableAsName.L] = f.TableName.Name.L
-				} else {
-					tblNames[f.TableName.Name.L] = f.TableName.Name.L
-				}
-			}
-		} else {
-			schema := e.SelectExec.Schema()
-			for _, s := range schema {
-				tblNames[s.TblName.L] = s.TblName.L
+		fs := e.SelectExec.Fields()
+		for _, f := range fs {
+			if len(f.TableAsName.L) > 0 {
+				tblNames[f.TableAsName.L] = f.TableName.Name.L
+			} else {
+				tblNames[f.TableName.Name.L] = f.TableName.Name.L
 			}
 		}
 		if len(tblNames) != 0 {
diff --git a/interpreter/main.go b/interpreter/main.go
index 0ff8af403e056..7d84c5f8d4ea3 100644
--- a/interpreter/main.go
+++ b/interpreter/main.go
@@ -27,18 +27,16 @@ import (
 	"github.com/ngaut/log"
 	"github.com/peterh/liner"
 	"github.com/pingcap/tidb"
-	"github.com/pingcap/tidb/plan"
 	"github.com/pingcap/tidb/terror"
 	"github.com/pingcap/tidb/util/printer"
 )
 
 var (
-	logLevel   = flag.String("L", "error", "log level")
-	store      = flag.String("store", "goleveldb", "the name for the registered storage, e.g. memory, goleveldb, boltdb")
-	dbPath     = flag.String("dbpath", "test", "db path")
-	dbName     = flag.String("dbname", "test", "default db name")
-	lease      = flag.Int("lease", 1, "schema lease seconds, very dangerous to change only if you know what you do")
-	useNewPlan = flag.Int("newplan", 1, "If use new planner.")
+	logLevel = flag.String("L", "error", "log level")
+	store    = flag.String("store", "goleveldb", "the name for the registered storage, e.g. memory, goleveldb, boltdb")
+	dbPath   = flag.String("dbpath", "test", "db path")
+	dbName   = flag.String("dbname", "test", "default db name")
+	lease    = flag.Int("lease", 1, "schema lease seconds, very dangerous to change only if you know what you do")
 
 	line        *liner.State
 	historyPath = "/tmp/tidb_interpreter"
@@ -180,10 +178,6 @@ func main() {
 
 	tidb.SetSchemaLease(time.Duration(*lease) * time.Second)
 
-	if *useNewPlan == 0 {
-		plan.UseNewPlanner = false
-	}
-
 	// use test as default DB.
 	mdb, err := sql.Open(tidb.DriverName, *store+"://"+*dbPath+"/"+*dbName)
 	if err != nil {
diff --git a/plan/logical_plan_builder.go b/plan/logical_plan_builder.go
index 243fba3b3a265..784583dde27cf 100644
--- a/plan/logical_plan_builder.go
+++ b/plan/logical_plan_builder.go
@@ -25,9 +25,6 @@ import (
 	"github.com/pingcap/tidb/util/types"
 )
 
-// UseNewPlanner means if use the new planner.
-var UseNewPlanner = true
-
 type idAllocator struct {
 	id int
 }
diff --git a/plan/plan_test.go b/plan/plan_test.go
index b94bf478259b2..77beabc6043d0 100644
--- a/plan/plan_test.go
+++ b/plan/plan_test.go
@@ -98,7 +98,6 @@ func newMockResolve(node ast.Node) error {
 }
 
 func (s *testPlanSuite) TestPredicatePushDown(c *C) {
-	UseNewPlanner = true
 	defer testleak.AfterTest(c)()
 	cases := []struct {
 		sql   string
@@ -205,11 +204,9 @@ func (s *testPlanSuite) TestPredicatePushDown(c *C) {
 		c.Assert(err, IsNil)
 		c.Assert(ToString(p), Equals, ca.best, Commentf("for %s", ca.sql))
 	}
-	UseNewPlanner = false
 }
 
 func (s *testPlanSuite) TestJoinReOrder(c *C) {
-	UseNewPlanner = true
 	defer testleak.AfterTest(c)()
 	cases := []struct {
 		sql  string
@@ -263,11 +260,9 @@ func (s *testPlanSuite) TestJoinReOrder(c *C) {
 		p = res.p.PushLimit(nil)
 		c.Assert(ToString(p), Equals, ca.best, Commentf("for %s", ca.sql))
 	}
-	UseNewPlanner = false
 }
 
 func (s *testPlanSuite) TestCBO(c *C) {
-	UseNewPlanner = true
 	defer testleak.AfterTest(c)()
 	cases := []struct {
 		sql  string
@@ -353,11 +348,9 @@ func (s *testPlanSuite) TestCBO(c *C) {
 		p = res.p.PushLimit(nil)
 		c.Assert(ToString(p), Equals, ca.best, Commentf("for %s", ca.sql))
 	}
-	UseNewPlanner = false
 }
 
 func (s *testPlanSuite) TestRefine(c *C) {
-	UseNewPlanner = true
 	defer testleak.AfterTest(c)()
 	cases := []struct {
 		sql  string
@@ -517,11 +510,9 @@ func (s *testPlanSuite) TestRefine(c *C) {
 		np := res.p.PushLimit(nil)
 		c.Assert(ToString(np), Equals, ca.best, Commentf("for %s", ca.sql))
 	}
-	UseNewPlanner = false
 }
 
 func (s *testPlanSuite) TestColumnPruning(c *C) {
-	UseNewPlanner = true
 	defer testleak.AfterTest(c)()
 	cases := []struct {
 		sql string
@@ -653,7 +644,6 @@ func (s *testPlanSuite) TestColumnPruning(c *C) {
 		c.Assert(err, IsNil)
 		check(p, c, ca.ans, comment)
 	}
-	UseNewPlanner = false
 }
 
 func (s *testPlanSuite) TestAllocID(c *C) {
@@ -667,7 +657,6 @@ func (s *testPlanSuite) TestAllocID(c *C) {
 }
 
 func (s *testPlanSuite) TestNewRangeBuilder(c *C) {
-	UseNewPlanner = true
 	defer testleak.AfterTest(c)()
 	rb := &rangeBuilder{}
 
@@ -850,7 +839,6 @@ func (s *testPlanSuite) TestNewRangeBuilder(c *C) {
 		got := fmt.Sprintf("%v", result)
 		c.Assert(got, Equals, ca.resultStr, Commentf("different for expr %s", ca.exprStr))
 	}
-	UseNewPlanner = false
 }
 
 func (s *testPlanSuite) TestTableScanWithOrder(c *C) {
@@ -886,7 +874,6 @@ func (s *testPlanSuite) TestTableScanWithOrder(c *C) {
 }
 
 func (s *testPlanSuite) TestConstantFolding(c *C) {
-	UseNewPlanner = true
 	defer testleak.AfterTest(c)()
 
 	cases := []struct {
@@ -956,7 +943,6 @@ func (s *testPlanSuite) TestConstantFolding(c *C) {
 
 		c.Assert(expression.ComposeCNFCondition(selection.Conditions).ToString(), Equals, ca.resultStr, Commentf("different for expr %s", ca.exprStr))
 	}
-	UseNewPlanner = false
 }
 
 func (s *testPlanSuite) TestCoveringIndex(c *C) {
diff --git a/tidb-server/main.go b/tidb-server/main.go
index 29e3aa63fcd0d..86f32423ad1d6 100644
--- a/tidb-server/main.go
+++ b/tidb-server/main.go
@@ -28,7 +28,6 @@ import (
 	"github.com/pingcap/tidb"
 	"github.com/pingcap/tidb/metric"
 	"github.com/pingcap/tidb/perfschema"
-	"github.com/pingcap/tidb/plan"
 	"github.com/pingcap/tidb/server"
 	"github.com/pingcap/tidb/store/localstore/boltdb"
 	"github.com/pingcap/tidb/store/tikv"
@@ -46,7 +45,6 @@ var (
 	socket       = flag.String("socket", "", "The socket file to use for connection.")
 	enablePS     = flag.Bool("perfschema", false, "If enable performance schema.")
 	reportStatus = flag.Bool("report-status", true, "If enable status report HTTP service.")
-	useNewPlan   = flag.Bool("newplan", true, "If use new planner.")
 	logFile      = flag.String("log-file", "", "log file path")
 )
 
@@ -94,10 +92,6 @@ func main() {
 		perfschema.EnablePerfSchema()
 	}
 
-	if !*useNewPlan {
-		plan.UseNewPlanner = false
-	}
-
 	// Create a session to load information schema.
 	se, err := tidb.CreateSession(store)
 	if err != nil {