diff --git a/expression/builtin_cast_vec.go b/expression/builtin_cast_vec.go
index bd80349fe88a3..32dd7f32f863c 100644
--- a/expression/builtin_cast_vec.go
+++ b/expression/builtin_cast_vec.go
@@ -282,11 +282,41 @@ func (b *builtinCastRealAsIntSig) vecEvalInt(input *chunk.Chunk, result *chunk.C
 }
 
 func (b *builtinCastTimeAsRealSig) vectorized() bool {
-	return false
+	return true
 }
 
 func (b *builtinCastTimeAsRealSig) vecEvalReal(input *chunk.Chunk, result *chunk.Column) error {
-	return errors.Errorf("not implemented")
+	n := input.NumRows()
+	buf, err := b.bufAllocator.get(types.ETDatetime, n)
+	if err != nil {
+		return err
+	}
+	defer b.bufAllocator.put(buf)
+	if err := b.args[0].VecEvalTime(b.ctx, input, buf); err != nil {
+		return err
+	}
+	result.ResizeFloat64(n, false)
+	result.MergeNulls(buf)
+	times := buf.Times()
+	f64s := result.Float64s()
+	for i := 0; i < n; i++ {
+		if result.IsNull(i) {
+			continue
+		}
+		f64, err := times[i].ToNumber().ToFloat64()
+		if err != nil {
+			if types.ErrOverflow.Equal(err) {
+				err = b.ctx.GetSessionVars().StmtCtx.HandleOverflow(err, err)
+			}
+			if err != nil {
+				return err
+			}
+			result.SetNull(i, true)
+			continue
+		}
+		f64s[i] = f64
+	}
+	return nil
 }
 
 func (b *builtinCastStringAsJSONSig) vectorized() bool {
diff --git a/expression/builtin_cast_vec_test.go b/expression/builtin_cast_vec_test.go
index 287a834315550..769eda224fbb1 100644
--- a/expression/builtin_cast_vec_test.go
+++ b/expression/builtin_cast_vec_test.go
@@ -28,6 +28,7 @@ var vecBuiltinCastCases = map[string][]vecExprBenchCase{
 		{retEvalType: types.ETDuration, childrenTypes: []types.EvalType{types.ETInt}, geners: []dataGenerator{new(randDurInt)}},
 		{retEvalType: types.ETReal, childrenTypes: []types.EvalType{types.ETReal}},
 		{retEvalType: types.ETReal, childrenTypes: []types.EvalType{types.ETDecimal}},
+		{retEvalType: types.ETReal, childrenTypes: []types.EvalType{types.ETDatetime}},
 		{retEvalType: types.ETDuration, childrenTypes: []types.EvalType{types.ETDatetime},
 			geners: []dataGenerator{&dateTimeGenerWithFsp{
 				defaultGener: defaultGener{nullRation: 0.2, eType: types.ETDatetime},