diff --git a/cdc/entry/mounter.go b/cdc/entry/mounter.go
index 43dd63821aa..1df12a205f2 100644
--- a/cdc/entry/mounter.go
+++ b/cdc/entry/mounter.go
@@ -292,6 +292,7 @@ func UnmarshalDDL(raw *model.RawKVEntry) (*timodel.Job, error) {
 	if err != nil {
 		return nil, errors.Trace(err)
 	}
+	log.Debug("get new DDL job", zap.String("detail", job.String()))
 	if !job.IsDone() && !job.IsSynced() {
 		return nil, nil
 	}
@@ -449,25 +450,41 @@ func formatColVal(datum types.Datum, tp byte) (value interface{}, warn string, e
 		}
 		return v, warn, nil
 	default:
-		// FIXME: GetValue() may return some types that go sql not support, which will cause sink DML fail
+		// NOTICE: GetValue() may return some types that go sql not support, which will cause sink DML fail
 		// Make specified convert upper if you need
 		// Go sql support type ref to: https://github.com/golang/go/blob/go1.17.4/src/database/sql/driver/types.go#L236
 		return datum.GetValue(), "", nil
 	}
 }
 
+// Scenarios when call this function:
+// (1) column define default null at creating + insert without explicit column
+// (2) alter table add column default xxx + old existing data
+// (3) amend + insert without explicit column + alter table add column default xxx
+// (4) online DDL drop column + data insert at state delete-only
+//
 // getDefaultOrZeroValue return interface{} need to meet to require type in
 // https://github.com/golang/go/blob/go1.17.4/src/database/sql/driver/types.go#L236
 // Supported type is: nil, basic type(Int, Int8,..., Float32, Float64, String), Slice(uint8), other types not support
 func getDefaultOrZeroValue(col *timodel.ColumnInfo) (interface{}, string, error) {
 	var d types.Datum
+	// NOTICE: SHOULD use OriginDefaultValue here, more info pls ref to
+	// https://github.com/pingcap/tiflow/issues/4048
+	// FIXME: Too many corner cases may hit here, like type truncate, timezone
+	// (1) If this column is uk(no pk), will cause data inconsistency in Scenarios(2)
+	// (2) If not fix here, will cause data inconsistency in Scenarios(3) directly
+	// Ref: https://github.com/pingcap/tidb/blob/d2c352980a43bb593db81fd1db996f47af596d91/table/column.go#L489
+	if col.GetOriginDefaultValue() != nil {
+		d = types.NewDatum(col.GetOriginDefaultValue())
+		return d.GetValue(), "", nil
+	}
+
 	if !mysql.HasNotNullFlag(col.Flag) {
-		// see https://github.com/pingcap/tidb/issues/9304
+		// NOTICE: NotNullCheck need do after OriginDefaultValue check, as when TiDB meet "amend + add column default xxx",
+		// ref: https://github.com/pingcap/ticdc/issues/3929
 		// must use null if TiDB not write the column value when default value is null
-		// and the value is null
+		// and the value is null, see https://github.com/pingcap/tidb/issues/9304
 		d = types.NewDatum(nil)
-	} else if col.GetDefaultValue() != nil {
-		d = types.NewDatum(col.GetDefaultValue())
 	} else {
 		switch col.Tp {
 		case mysql.TypeEnum:
@@ -478,6 +495,9 @@ func getDefaultOrZeroValue(col *timodel.ColumnInfo) (interface{}, string, error)
 			return emptyBytes, "", nil
 		default:
 			d = table.GetZeroValue(col)
+			if d.IsNull() {
+				log.Error("meet unsupported column type", zap.String("column info", col.String()))
+			}
 		}
 	}
 
diff --git a/cdc/entry/mounter_test.go b/cdc/entry/mounter_test.go
index 34859d9fde7..89e3e87dfde 100644
--- a/cdc/entry/mounter_test.go
+++ b/cdc/entry/mounter_test.go
@@ -400,8 +400,10 @@ type columnInfoAndResult struct {
 	Res     interface{}
 }
 
-func TestFormatColVal(t *testing.T) {}
-
+// We use OriginDefaultValue instead of DefaultValue in the ut, pls ref to
+// https://github.com/pingcap/tiflow/issues/4048
+// FIXME: OriginDefaultValue seems always to be string, and test more corner case
+// Ref: https://github.com/pingcap/tidb/blob/d2c352980a43bb593db81fd1db996f47af596d91/table/column.go#L489
 func TestGetDefaultZeroValue(t *testing.T) {
 	colAndRess := []columnInfoAndResult{
 		// mysql flag null
@@ -413,7 +415,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: nil,
 		},
-		// mysql.TypeTiny
+		// mysql.TypeTiny + notnull + nodefault
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -423,7 +425,60 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: int64(0),
 		},
-		// mysql.TypeShort
+		// mysql.TypeTiny + notnull + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: -1314,
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeTiny,
+					Flag: mysql.NotNullFlag,
+				},
+			},
+			Res: int64(-1314),
+		},
+		// mysql.TypeTiny + notnull + default + unsigned
+		{
+			ColInfo: timodel.ColumnInfo{
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeTiny,
+					Flag: mysql.NotNullFlag | mysql.UnsignedFlag,
+				},
+			},
+			Res: uint64(0),
+		},
+		// mysql.TypeTiny + notnull + unsigned
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: uint64(1314),
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeTiny,
+					Flag: mysql.NotNullFlag | mysql.UnsignedFlag,
+				},
+			},
+			Res: uint64(1314),
+		},
+		// mysql.TypeTiny + null + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: -1314,
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeTiny,
+					Flag: uint(0),
+				},
+			},
+			Res: int64(-1314),
+		},
+		// mysql.TypeTiny + null + nodefault
+		{
+			ColInfo: timodel.ColumnInfo{
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeTiny,
+					Flag: uint(0),
+				},
+			},
+			Res: nil,
+		},
+		// mysql.TypeShort, others testCases same as tiny
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -433,7 +488,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: int64(0),
 		},
-		// mysql.TypeLong
+		// mysql.TypeLong, others testCases same as tiny
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -443,7 +498,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: int64(0),
 		},
-		// mysql.TypeLonglong
+		// mysql.TypeLonglong, others testCases same as tiny
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -453,7 +508,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: int64(0),
 		},
-		// mysql.TypeInt24
+		// mysql.TypeInt24, others testCases same as tiny
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -463,7 +518,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: int64(0),
 		},
-		// mysql.TypeFloat
+		// mysql.TypeFloat + notnull + nodefault
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -473,7 +528,60 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: float64(0),
 		},
-		// mysql.TypeDouble
+		// mysql.TypeFloat + notnull + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: -3.1415,
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeFloat,
+					Flag: mysql.NotNullFlag,
+				},
+			},
+			Res: float64(-3.1415),
+		},
+		// mysql.TypeFloat + notnull + default + unsigned
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: 3.1415,
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeFloat,
+					Flag: mysql.NotNullFlag | mysql.UnsignedFlag,
+				},
+			},
+			Res: float64(3.1415),
+		},
+		// mysql.TypeFloat + notnull + unsigned
+		{
+			ColInfo: timodel.ColumnInfo{
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeFloat,
+					Flag: mysql.NotNullFlag | mysql.UnsignedFlag,
+				},
+			},
+			Res: float64(0),
+		},
+		// mysql.TypeFloat + null + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: -3.1415,
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeFloat,
+					Flag: uint(0),
+				},
+			},
+			Res: float64(-3.1415),
+		},
+		// mysql.TypeFloat + null + nodefault
+		{
+			ColInfo: timodel.ColumnInfo{
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeFloat,
+					Flag: uint(0),
+				},
+			},
+			Res: nil,
+		},
+		// mysql.TypeDouble, other testCases same as float
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -483,7 +591,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: float64(0),
 		},
-		// mysql.TypeNewDecimal
+		// mysql.TypeNewDecimal + notnull + nodefault
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -493,19 +601,43 @@ func TestGetDefaultZeroValue(t *testing.T) {
 					Decimal: 2,
 				},
 			},
-			Res: "0", // related with Flen and Decimal, [TODO] need check default
+			Res: "0", // related with Flen and Decimal
+		},
+		// mysql.TypeNewDecimal + null + nodefault
+		{
+			ColInfo: timodel.ColumnInfo{
+				FieldType: types.FieldType{
+					Tp:      mysql.TypeNewDecimal,
+					Flag:    uint(0),
+					Flen:    5,
+					Decimal: 2,
+				},
+			},
+			Res: nil,
+		},
+		// mysql.TypeNewDecimal + null + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: "-3.14", // no float
+				FieldType: types.FieldType{
+					Tp:      mysql.TypeNewDecimal,
+					Flag:    uint(0),
+					Flen:    5,
+					Decimal: 2,
+				},
+			},
+			Res: "-3.14",
 		},
 		// mysql.TypeNull
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
-					Tp:   mysql.TypeNull,
-					Flag: mysql.NotNullFlag,
+					Tp: mysql.TypeNull,
 				},
 			},
 			Res: nil,
 		},
-		// mysql.TypeTimestamp
+		// mysql.TypeTimestamp + notnull + nodefault
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -515,7 +647,29 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: "0000-00-00 00:00:00",
 		},
-		// mysql.TypeDate
+		// mysql.TypeTimestamp + notnull + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: "2020-11-19 12:12:12",
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeTimestamp,
+					Flag: mysql.NotNullFlag,
+				},
+			},
+			Res: "2020-11-19 12:12:12",
+		},
+		// mysql.TypeTimestamp + null + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: "2020-11-19 12:12:12",
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeTimestamp,
+					Flag: mysql.NotNullFlag,
+				},
+			},
+			Res: "2020-11-19 12:12:12",
+		},
+		// mysql.TypeDate, other testCases same as TypeTimestamp
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -525,7 +679,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: "0000-00-00",
 		},
-		// mysql.TypeDuration
+		// mysql.TypeDuration, other testCases same as TypeTimestamp
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -535,7 +689,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: "00:00:00",
 		},
-		// mysql.TypeDatetime
+		// mysql.TypeDatetime, other testCases same as TypeTimestamp
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -545,7 +699,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: "0000-00-00 00:00:00",
 		},
-		// mysql.TypeYear
+		// mysql.TypeYear + notnull + nodefault
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -555,6 +709,18 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: int64(0),
 		},
+		// mysql.TypeYear + notnull + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: "2021",
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeYear,
+					Flag: mysql.NotNullFlag,
+				},
+			},
+			// TypeYear default value will be a string and then translate to []byte
+			Res: "2021",
+		},
 		// mysql.TypeNewDate
 		{
 			ColInfo: timodel.ColumnInfo{
@@ -565,7 +731,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: nil, // [TODO] seems not support by TiDB, need check
 		},
-		// mysql.TypeVarchar
+		// mysql.TypeVarchar + notnull + nodefault
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -575,6 +741,18 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: []byte{},
 		},
+		// mysql.TypeVarchar + notnull + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: "e0",
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeVarchar,
+					Flag: mysql.NotNullFlag,
+				},
+			},
+			// TypeVarchar default value will be a string and then translate to []byte
+			Res: "e0",
+		},
 		// mysql.TypeTinyBlob
 		{
 			ColInfo: timodel.ColumnInfo{
@@ -645,6 +823,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: uint64(0),
 		},
+		// BLOB, TEXT, GEOMETRY or JSON column can't have a default value
 		// mysql.TypeJSON
 		{
 			ColInfo: timodel.ColumnInfo{
@@ -655,7 +834,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: "null",
 		},
-		// mysql.TypeEnum
+		// mysql.TypeEnum + notnull + nodefault
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -664,9 +843,24 @@ func TestGetDefaultZeroValue(t *testing.T) {
 					Elems: []string{"e0", "e1"},
 				},
 			},
+			// TypeEnum value will be a string and then translate to []byte
+			// NotNull && no default will choose first element
 			Res: uint64(0),
 		},
-		// mysql.TypeSet
+		// mysql.TypeEnum + notnull + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: "e1",
+				FieldType: types.FieldType{
+					Tp:    mysql.TypeEnum,
+					Flag:  mysql.NotNullFlag,
+					Elems: []string{"e0", "e1"},
+				},
+			},
+			// TypeEnum default value will be a string and then translate to []byte
+			Res: "e1",
+		},
+		// mysql.TypeSet + notnull
 		{
 			ColInfo: timodel.ColumnInfo{
 				FieldType: types.FieldType{
@@ -676,6 +870,18 @@ func TestGetDefaultZeroValue(t *testing.T) {
 			},
 			Res: uint64(0),
 		},
+		// mysql.TypeSet + notnull + default
+		{
+			ColInfo: timodel.ColumnInfo{
+				OriginDefaultValue: "1,e",
+				FieldType: types.FieldType{
+					Tp:   mysql.TypeSet,
+					Flag: mysql.NotNullFlag,
+				},
+			},
+			// TypeSet default value will be a string and then translate to []byte
+			Res: "1,e",
+		},
 		// mysql.TypeGeometry
 		{
 			ColInfo: timodel.ColumnInfo{
@@ -684,7 +890,7 @@ func TestGetDefaultZeroValue(t *testing.T) {
 					Flag: mysql.NotNullFlag,
 				},
 			},
-			Res: nil,
+			Res: nil, // not support yet
 		},
 	}
 	testGetDefaultZeroValue(t, colAndRess)
diff --git a/tests/integration_tests/multi_source/diff_config.toml b/tests/integration_tests/multi_source/diff_config.toml
index 103c77690c9..fea5e9f6ab3 100644
--- a/tests/integration_tests/multi_source/diff_config.toml
+++ b/tests/integration_tests/multi_source/diff_config.toml
@@ -9,20 +9,20 @@ check-struct-only = false
 [task]
     output-dir = "/tmp/tidb_cdc_test/multi_source/sync_diff/output"
 
-    source-instances = ["mysql1"]
+    source-instances = ["tidb0"]
 
-    target-instance = "tidb0"
+    target-instance = "mysql1"
 
     target-check-tables = ["test.?*"]
 
 [data-sources]
-[data-sources.mysql1]
+[data-sources.tidb0]
     host = "127.0.0.1"
     port = 4000
     user = "root"
     password = ""
 
-[data-sources.tidb0]
+[data-sources.mysql1]
     host = "127.0.0.1"
     port = 3306
     user = "root"