diff --git a/plan/optimizer.go b/plan/optimizer.go
index bbe73bb53d..9c8bf62a30 100644
--- a/plan/optimizer.go
+++ b/plan/optimizer.go
@@ -15,7 +15,6 @@ package plan
 
 import (
 	"github.com/juju/errors"
-	"github.com/ngaut/log"
 	"github.com/pingcap/tidb/ast"
 	"github.com/pingcap/tidb/context"
 	"github.com/pingcap/tidb/expression"
@@ -103,7 +102,6 @@ func doOptimize(flag uint64, logic LogicalPlan, ctx context.Context, allocator *
 		return nil, errors.Trace(ErrCartesianProductUnsupported)
 	}
 	logic.ResolveIndicesAndCorCols()
-	log.Warnf("PLAN %s", ToString(logic))
 	return physicalOptimize(flag, logic, allocator)
 }