diff --git a/core/blockchain_repair_test.go b/core/blockchain_repair_test.go
index 07f154b4fa..aeeb9095d8 100644
--- a/core/blockchain_repair_test.go
+++ b/core/blockchain_repair_test.go
@@ -1757,8 +1757,8 @@ func testRepair(t *testing.T, tt *rewindTest, snapshots bool) {
 
 func testRepairWithScheme(t *testing.T, tt *rewindTest, snapshots bool, scheme string) {
 	// It's hard to follow the test case, visualize the input
-	// log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
-	// fmt.Println(tt.dump(true))
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
+	// fmt.Println(tt.dump(false))
 
 	// Create a temporary persistent database
 	datadir := t.TempDir()
@@ -1908,7 +1908,7 @@ func TestIssue23496(t *testing.T) {
 
 func testIssue23496(t *testing.T, scheme string) {
 	// It's hard to follow the test case, visualize the input
-	//log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
 
 	// Create a temporary persistent database
 	datadir := t.TempDir()
diff --git a/core/blockchain_sethead_test.go b/core/blockchain_sethead_test.go
index 5a62d6b25f..123c2c9af1 100644
--- a/core/blockchain_sethead_test.go
+++ b/core/blockchain_sethead_test.go
@@ -1961,7 +1961,7 @@ func testSetHead(t *testing.T, tt *rewindTest, snapshots bool) {
 
 func testSetHeadWithScheme(t *testing.T, tt *rewindTest, snapshots bool, scheme string) {
 	// It's hard to follow the test case, visualize the input
-	// log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
 	// fmt.Println(tt.dump(false))
 
 	// Create a temporary persistent database
diff --git a/core/blockchain_snapshot_test.go b/core/blockchain_snapshot_test.go
index 45d33bb0a0..3803c153e7 100644
--- a/core/blockchain_snapshot_test.go
+++ b/core/blockchain_snapshot_test.go
@@ -222,8 +222,8 @@ type snapshotTest struct {
 
 func (snaptest *snapshotTest) test(t *testing.T) {
 	// It's hard to follow the test case, visualize the input
-	// log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
-	// fmt.Println(tt.dump())
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
+	// fmt.Println(snaptest.dump())
 	chain, blocks := snaptest.prepare(t)
 
 	// Restart the chain normally
@@ -245,8 +245,8 @@ type crashSnapshotTest struct {
 
 func (snaptest *crashSnapshotTest) test(t *testing.T) {
 	// It's hard to follow the test case, visualize the input
-	// log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
-	// fmt.Println(tt.dump())
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
+	// fmt.Println(snaptest.dump())
 	chain, blocks := snaptest.prepare(t)
 
 	// Pull the plug on the database, simulating a hard crash
@@ -297,8 +297,8 @@ type gappedSnapshotTest struct {
 
 func (snaptest *gappedSnapshotTest) test(t *testing.T) {
 	// It's hard to follow the test case, visualize the input
-	// log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
-	// fmt.Println(tt.dump())
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
+	// fmt.Println(snaptest.dump())
 	chain, blocks := snaptest.prepare(t)
 
 	// Insert blocks without enabling snapshot if gapping is required.
@@ -341,8 +341,8 @@ type setHeadSnapshotTest struct {
 
 func (snaptest *setHeadSnapshotTest) test(t *testing.T) {
 	// It's hard to follow the test case, visualize the input
-	// log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
-	// fmt.Println(tt.dump())
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
+	// fmt.Println(snaptest.dump())
 	chain, blocks := snaptest.prepare(t)
 
 	// Rewind the chain if setHead operation is required.
@@ -370,8 +370,8 @@ type wipeCrashSnapshotTest struct {
 
 func (snaptest *wipeCrashSnapshotTest) test(t *testing.T) {
 	// It's hard to follow the test case, visualize the input
-	// log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
-	// fmt.Println(tt.dump())
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
+	// fmt.Println(snaptest.dump())
 	chain, blocks := snaptest.prepare(t)
 
 	// Firstly, stop the chain properly, with all snapshot journal
diff --git a/core/blockchain_test.go b/core/blockchain_test.go
index d8c436fcd6..d2bf074c65 100644
--- a/core/blockchain_test.go
+++ b/core/blockchain_test.go
@@ -2126,9 +2126,9 @@ func testSideImport(t *testing.T, numCanonBlocksInSidechain, blocksBetweenCommon
 //	[ Cn, Cn+1, Cc, Sn+3 ... Sm]
 //	^    ^    ^  pruned
 func TestPrunedImportSide(t *testing.T) {
-	//glogger := log.NewGlogHandler(log.StreamHandler(os.Stdout, log.TerminalFormat(false)))
-	//glogger.Verbosity(3)
-	//log.Root().SetHandler(log.Handler(glogger))
+	// glogger := log.NewGlogHandler(log.NewTerminalHandler(os.Stderr, false))
+	// glogger.Verbosity(3)
+	// log.SetDefault(log.NewLogger(glogger))
 	testSideImport(t, 3, 3, -1)
 	testSideImport(t, 3, -3, -1)
 	testSideImport(t, 10, 0, -1)
@@ -2137,9 +2137,9 @@ func TestPrunedImportSide(t *testing.T) {
 }
 
 func TestPrunedImportSideWithMerging(t *testing.T) {
-	//glogger := log.NewGlogHandler(log.StreamHandler(os.Stdout, log.TerminalFormat(false)))
-	//glogger.Verbosity(3)
-	//log.Root().SetHandler(log.Handler(glogger))
+	// glogger := log.NewGlogHandler(log.NewTerminalHandler(os.Stderr, false))
+	// glogger.Verbosity(3)
+	// log.SetDefault(log.NewLogger(glogger))
 	testSideImport(t, 3, 3, 0)
 	testSideImport(t, 3, -3, 0)
 	testSideImport(t, 10, 0, 0)
@@ -3629,7 +3629,7 @@ func TestSetCanonical(t *testing.T) {
 }
 
 func testSetCanonical(t *testing.T, scheme string) {
-	//log.Root().SetHandler(log.LvlFilterHandler(log.LvlDebug, log.StreamHandler(os.Stderr, log.TerminalFormat(true))))
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelInfo, true)))
 
 	var (
 		key, _  = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")