If you are writing Chinese text in the forum, then you can enclose this text in special tags which will render the text in a better and bigger font.
For Simplified Chinese, use the jiantizi tag
Example with tags: [jiantizi]简体字[/jiantizi]
Example without tags: 简体字
For Traditional Chinese Characters, use the fantizi tag
Example with tags: 繁體字
Example without tags: 繁體字
In the post editor, you will find buttons for these tags.