diff --git a/ddl_checker/main.go b/ddl_checker/main.go
index 7e9adf004..40c555744 100644
--- a/ddl_checker/main.go
+++ b/ddl_checker/main.go
@@ -18,13 +18,14 @@ import (
 	"context"
 	"flag"
 	"fmt"
+	"os"
+	"strings"
+	"unicode"
+
 	_ "github.com/go-sql-driver/mysql"
 	"github.com/pingcap/errors"
 	"github.com/pingcap/tidb-tools/pkg/dbutil"
 	"github.com/pingcap/tidb-tools/pkg/ddl-checker"
-	"os"
-	"strings"
-	"unicode"
 )
 
 var (
diff --git a/pkg/ddl-checker/ddl_syncer.go b/pkg/ddl-checker/ddl_syncer.go
index b052969bb..7ab1d77b9 100644
--- a/pkg/ddl-checker/ddl_syncer.go
+++ b/pkg/ddl-checker/ddl_syncer.go
@@ -16,6 +16,7 @@ package checker
 import (
 	"context"
 	"database/sql"
+
 	"github.com/pingcap/errors"
 	"github.com/pingcap/tidb-tools/pkg/dbutil"
 )
diff --git a/pkg/ddl-checker/executable_checker.go b/pkg/ddl-checker/executable_checker.go
index 8022c0688..d6a66f129 100644
--- a/pkg/ddl-checker/executable_checker.go
+++ b/pkg/ddl-checker/executable_checker.go
@@ -16,6 +16,7 @@ package checker
 import (
 	"context"
 	"fmt"
+
 	"github.com/pingcap/errors"
 	"github.com/pingcap/parser"
 	"github.com/pingcap/parser/ast"
diff --git a/pkg/ddl-checker/executable_checker_test.go b/pkg/ddl-checker/executable_checker_test.go
index 10db55b68..120a80a6b 100644
--- a/pkg/ddl-checker/executable_checker_test.go
+++ b/pkg/ddl-checker/executable_checker_test.go
@@ -16,8 +16,9 @@ package checker
 import (
 	"container/list"
 	"context"
-	. "github.com/pingcap/check"
 	"testing"
+
+	. "github.com/pingcap/check"
 )
 
 var _ = Suite(&testSuite{})
diff --git a/pkg/diff/chunk.go b/pkg/diff/chunk.go
index 7c6e55bf6..d733dac0e 100644
--- a/pkg/diff/chunk.go
+++ b/pkg/diff/chunk.go
@@ -247,7 +247,6 @@ func (s *randomSpliter) splitRange(db *sql.DB, chunk *chunkRange, count int, sch
 			return append(chunks, chunk), nil
 		}
 
-
 		// choose the next column to split data
 		useNewColumn = true
 		splitCol = columns[colNum].Name.O
diff --git a/pkg/utils/urls_test.go b/pkg/utils/urls_test.go
index 593359ab5..8bb6635df 100644
--- a/pkg/utils/urls_test.go
+++ b/pkg/utils/urls_test.go
@@ -14,8 +14,9 @@
 package utils
 
 import (
-	. "github.com/pingcap/check"
 	"testing"
+
+	. "github.com/pingcap/check"
 )
 
 func TestClient(t *testing.T) {