diff --git a/expression/builtin_encryption_vec.go b/expression/builtin_encryption_vec.go
index 13239ffeea737..57d3693ee80fb 100644
--- a/expression/builtin_encryption_vec.go
+++ b/expression/builtin_encryption_vec.go
@@ -37,11 +37,42 @@ func (b *builtinAesEncryptIVSig) vecEvalString(input *chunk.Chunk, result *chunk
 }
 
 func (b *builtinDecodeSig) vectorized() bool {
-	return false
+	return true
 }
 
 func (b *builtinDecodeSig) vecEvalString(input *chunk.Chunk, result *chunk.Column) error {
-	return errors.Errorf("not implemented")
+	n := input.NumRows()
+	buf, err := b.bufAllocator.get(types.ETString, n)
+	if err != nil {
+		return err
+	}
+	defer b.bufAllocator.put(buf)
+	if err := b.args[0].VecEvalString(b.ctx, input, buf); err != nil {
+		return err
+	}
+	buf1, err1 := b.bufAllocator.get(types.ETString, n)
+	if err1 != nil {
+		return err1
+	}
+	defer b.bufAllocator.put(buf1)
+	if err := b.args[1].VecEvalString(b.ctx, input, buf1); err != nil {
+		return err
+	}
+	result.ReserveString(n)
+	for i := 0; i < n; i++ {
+		if buf.IsNull(i) || buf1.IsNull(i) {
+			result.AppendNull()
+			continue
+		}
+		dataStr := buf.GetString(i)
+		passwordStr := buf1.GetString(i)
+		decodeStr, err := encrypt.SQLDecode(dataStr, passwordStr)
+		if err != nil {
+			return err
+		}
+		result.AppendString(decodeStr)
+	}
+	return nil
 }
 
 func (b *builtinEncodeSig) vectorized() bool {
diff --git a/expression/builtin_encryption_vec_test.go b/expression/builtin_encryption_vec_test.go
index e12262d9b1a83..dd94d88d94166 100644
--- a/expression/builtin_encryption_vec_test.go
+++ b/expression/builtin_encryption_vec_test.go
@@ -36,6 +36,9 @@ var vecBuiltinEncryptionCases = map[string][]vecExprBenchCase{
 	ast.Encode: {
 		{retEvalType: types.ETString, childrenTypes: []types.EvalType{types.ETString, types.ETString}},
 	},
+	ast.Decode: {
+		{retEvalType: types.ETString, childrenTypes: []types.EvalType{types.ETString, types.ETString}, geners: []dataGenerator{&randLenStrGener{10, 20}}},
+	},
 }
 
 func (s *testEvaluatorSuite) TestVectorizedBuiltinEncryptionFunc(c *C) {