diff --git a/CHANGELOG-2.0.md b/CHANGELOG-2.0.md
index f5c9bc894..df9d32b6e 100644
--- a/CHANGELOG-2.0.md
+++ b/CHANGELOG-2.0.md
@@ -13,6 +13,10 @@
 
 - [#2049](https://github.com/hyperf/hyperf/pull/2049) Optimized stdout when server restart for `hyperf/watcher`.
 
+## Changed
+
+- [#2301](https://github.com/hyperf/hyperf/pull/2031) The code of constants only support `int` and `string`.
+
 # v2.0.1 - 2020-07-02
 
 ## Added
diff --git a/src/constants/src/AnnotationReader.php b/src/constants/src/AnnotationReader.php
index 2363d5c62..0b73f363d 100644
--- a/src/constants/src/AnnotationReader.php
+++ b/src/constants/src/AnnotationReader.php
@@ -23,7 +23,8 @@ class AnnotationReader
         foreach ($classConstants as $classConstant) {
             $code = $classConstant->getValue();
             $docComment = $classConstant->getDocComment();
-            if ($docComment) {
+            // Not support float and bool, because it will be convert to int.
+            if ($docComment && (is_int($code) || is_string($code))) {
                 $result[$code] = $this->parse($docComment, $result[$code] ?? []);
             }
         }
diff --git a/src/constants/tests/AnnotationReaderTest.php b/src/constants/tests/AnnotationReaderTest.php
index aaa9054ab..7d1e09a6d 100644
--- a/src/constants/tests/AnnotationReaderTest.php
+++ b/src/constants/tests/AnnotationReaderTest.php
@@ -107,6 +107,15 @@ class AnnotationReaderTest extends TestCase
         $this->assertSame('Type disabled', ErrorCodeStub::getType(ErrorCodeStub::TYPE_DISABLE));
     }
 
+    public function testSupportTypes()
+    {
+        $container = $this->getContainer(true);
+        $this->assertSame('Type1001', ErrorCodeStub::getMessage(ErrorCodeStub::TYPE_INT));
+        $this->assertSame('', ErrorCodeStub::getMessage(ErrorCodeStub::TYPE_FLOAT));
+        $this->assertSame('Type1003.1', ErrorCodeStub::getMessage(ErrorCodeStub::TYPE_FLOAT_STRING));
+        $this->assertSame('TypeString', ErrorCodeStub::getMessage(ErrorCodeStub::TYPE_STRING));
+    }
+
     protected function getContainer($has = false)
     {
         $container = Mockery::mock(ContainerInterface::class);
diff --git a/src/constants/tests/Stub/ErrorCodeStub.php b/src/constants/tests/Stub/ErrorCodeStub.php
index 1b8c2f89b..5753fa204 100644
--- a/src/constants/tests/Stub/ErrorCodeStub.php
+++ b/src/constants/tests/Stub/ErrorCodeStub.php
@@ -62,4 +62,24 @@ class ErrorCodeStub extends AbstractConstants
      * @Type("Type disabled")
      */
     const TYPE_DISABLE = 0;
+
+    /**
+     * @Message("Type1001")
+     */
+    const TYPE_INT = 1001;
+
+    /**
+     * @Message("Type1002.1")
+     */
+    const TYPE_FLOAT = 1002.1;
+
+    /**
+     * @Message("Type1003.1")
+     */
+    const TYPE_FLOAT_STRING = '1003.1';
+
+    /**
+     * @Message("TypeString")
+     */
+    const TYPE_STRING = 'string';
 }