diff --git a/admin/js/hyperdown.js b/admin/js/hyperdown.js
index 5226c3b9..46430d4e 100644
--- a/admin/js/hyperdown.js
+++ b/admin/js/hyperdown.js
@@ -399,7 +399,7 @@
         if (block != null) {
           block = block.slice(0);
         }
-        if (!!(matches = line.match(/^(\s*)(~|`){3,}([^`~]*)$/i))) {
+        if (!!(matches = line.match(/^(\s*)(~{3,}|`{3,})([^`~]*)$/i))) {
           if (this.isBlock('code')) {
             isAfterList = block[3][2];
             if (isAfterList) {
diff --git a/install/Mysql.sql b/install/Mysql.sql
index 78f2ad6a..d6dd0607 100644
--- a/install/Mysql.sql
+++ b/install/Mysql.sql
@@ -49,7 +49,7 @@ CREATE TABLE `typecho_contents` (
   `slug` varchar(200) default NULL,
   `created` int(10) unsigned default '0',
   `modified` int(10) unsigned default '0',
-  `text` text,
+  `text` longtext,
   `order` int(10) unsigned default '0',
   `authorId` int(10) unsigned default '0',
   `template` varchar(32) default NULL,
diff --git a/var/HyperDown.php b/var/HyperDown.php
index a3af0321..ea84a7a4 100644
--- a/var/HyperDown.php
+++ b/var/HyperDown.php
@@ -522,7 +522,7 @@ class HyperDown
             $block = $this->getBlock();
 
             // code block is special
-            if (preg_match("/^(\s*)(~|`){3,}([^`~]*)$/i", $line, $matches)) {
+            if (preg_match("/^(\s*)(~{3,}|`{3,})([^`~]*)$/i", $line, $matches)) {
                 if ($this->isBlock('code')) {
                     $isAfterList = $block[3][2];