diff --git a/base.php b/base.php
index 78b3f920..66d53e9f 100644
--- a/base.php
+++ b/base.php
@@ -9,9 +9,9 @@
 // | Author: liu21st <liu21st@gmail.com>
 // +----------------------------------------------------------------------
 
-define('THINK_VERSION', '5.0.0 RC3');
-define('START_TIME', number_format(microtime(true), 8, '.', ''));
-define('START_MEM', memory_get_usage());
+define('THINK_VERSION', '5.0.0 RC4');
+define('THINK_START_TIME', number_format(microtime(true), 8, '.', ''));
+define('THINK_START_MEM', memory_get_usage());
 define('EXT', '.php');
 define('DS', DIRECTORY_SEPARATOR);
 defined('THINK_PATH') or define('THINK_PATH', __DIR__ . DS);
diff --git a/library/think/Debug.php b/library/think/Debug.php
index 92ad638e..1c0d12a4 100644
--- a/library/think/Debug.php
+++ b/library/think/Debug.php
@@ -63,7 +63,7 @@ class Debug
      */
     public static function getUseTime($dec = 6)
     {
-        return number_format((microtime(true) - START_TIME), $dec);
+        return number_format((microtime(true) - THINK_START_TIME), $dec);
     }
 
     /**
diff --git a/library/think/debug/Console.php b/library/think/debug/Console.php
index 6e89b9be..6eacf23c 100644
--- a/library/think/debug/Console.php
+++ b/library/think/debug/Console.php
@@ -42,9 +42,9 @@ class Console
     public function output(array $log = [])
     {
         // 获取基本信息
-        $runtime = number_format(microtime(true), 8, '.', '') - START_TIME;
+        $runtime = number_format(microtime(true), 8, '.', '') - THINK_START_TIME;
         $reqs    = number_format(1 / $runtime, 2);
-        $mem     = number_format((memory_get_usage() - START_MEM) / 1024, 2);
+        $mem     = number_format((memory_get_usage() - THINK_START_MEM) / 1024, 2);
 
         if (isset($_SERVER['HTTP_HOST'])) {
             $uri = $_SERVER['SERVER_PROTOCOL'] . ' ' . $_SERVER['REQUEST_METHOD'] . ' : ' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
diff --git a/library/think/debug/Html.php b/library/think/debug/Html.php
index 0426fb41..7f16dc0e 100644
--- a/library/think/debug/Html.php
+++ b/library/think/debug/Html.php
@@ -43,9 +43,9 @@ class Html
     {
 
         // 获取基本信息
-        $runtime = number_format(microtime(true), 8, '.', '') - START_TIME;
+        $runtime = number_format(microtime(true), 8, '.', '') - THINK_START_TIME;
         $reqs    = number_format(1 / $runtime, 2);
-        $mem     = number_format((memory_get_usage() - START_MEM) / 1024, 2);
+        $mem     = number_format((memory_get_usage() - THINK_START_MEM) / 1024, 2);
 
         // 页面Trace信息
         if (isset($_SERVER['HTTP_HOST'])) {
diff --git a/library/think/debug/Socket.php b/library/think/debug/Socket.php
index 9433dd09..ae018a04 100644
--- a/library/think/debug/Socket.php
+++ b/library/think/debug/Socket.php
@@ -65,10 +65,10 @@ class Socket
         if (!$this->check()) {
             return false;
         }
-        $runtime    = number_format(microtime(true), 8, '.', '') - START_TIME;
+        $runtime    = number_format(microtime(true), 8, '.', '') - THINK_START_TIME;
         $reqs       = number_format(1 / number_format($runtime, 8), 2);
         $time_str   = " [运行时间：{$runtime}s][吞吐率：{$reqs}req/s]";
-        $memory_use = number_format((memory_get_usage() - START_MEM) / 1024, 2);
+        $memory_use = number_format((memory_get_usage() - THINK_START_MEM) / 1024, 2);
         $memory_str = " [内存消耗：{$memory_use}kb]";
         $file_load  = " [文件加载：" . count(get_included_files()) . "]";
 
diff --git a/library/think/log/driver/File.php b/library/think/log/driver/File.php
index 76ade7ee..b3a077b2 100644
--- a/library/think/log/driver/File.php
+++ b/library/think/log/driver/File.php
@@ -54,10 +54,10 @@ class File
         } else {
             $current_uri = "cmd:" . implode(' ', $_SERVER['argv']);
         }
-        $runtime    = number_format(microtime(true), 8, '.', '') - START_TIME;
+        $runtime    = number_format(microtime(true), 8, '.', '') - THINK_START_TIME;
         $reqs       = number_format(1 / $runtime, 2);
         $time_str   = " [运行时间：{$runtime}s] [吞吐率：{$reqs}req/s]";
-        $memory_use = number_format((memory_get_usage() - START_MEM) / 1024, 2);
+        $memory_use = number_format((memory_get_usage() - THINK_START_MEM) / 1024, 2);
         $memory_str = " [内存消耗：{$memory_use}kb]";
         $file_load  = " [文件加载：" . count(get_included_files()) . "]";
 
diff --git a/library/think/log/driver/Sae.php b/library/think/log/driver/Sae.php
index a45f3a62..c593c09e 100644
--- a/library/think/log/driver/Sae.php
+++ b/library/think/log/driver/Sae.php
@@ -33,10 +33,10 @@ class Sae
         } else {
             $current_uri = "cmd:" . implode(' ', $_SERVER['argv']);
         }
-        $runtime    = number_format(microtime(true), 8, '.', '') - START_TIME;
+        $runtime    = number_format(microtime(true), 8, '.', '') - THINK_START_TIME;
         $reqs       = number_format(1 / $runtime, 2);
         $time_str   = " [运行时间：{$runtime}s] [吞吐率：{$reqs}req/s]";
-        $memory_use = number_format((memory_get_usage() - START_MEM) / 1024, 2);
+        $memory_use = number_format((memory_get_usage() - THINK_START_MEM) / 1024, 2);
         $memory_str = " [内存消耗：{$memory_use}kb]";
         $file_load  = " [文件加载：" . count(get_included_files()) . "]";
 
diff --git a/tests/thinkphp/baseTest.php b/tests/thinkphp/baseTest.php
index 3106a139..18f1d3dd 100644
--- a/tests/thinkphp/baseTest.php
+++ b/tests/thinkphp/baseTest.php
@@ -16,8 +16,8 @@ class baseTest extends \PHPUnit_Framework_TestCase
 {
     public function testConstants()
     {
-        $this->assertNotEmpty(START_TIME);
-        $this->assertNotEmpty(START_MEM);
+        $this->assertNotEmpty(THINK_START_TIME);
+        $this->assertNotEmpty(THINK_START_MEM);
         $this->assertNotEmpty(THINK_VERSION);
         $this->assertNotEmpty(DS);
         $this->assertNotEmpty(THINK_PATH);