用户可以参考如下方法，编辑public_html目录下的.htaccess文件,加入如下语句.如果public_html下没有.htaccess文件,新建一个即可.
注意:将 yourmaindomain.com修改为你的域名,将subfolder修改为你要指向的public_html下的子目录.最后一行中的index.php修改为你的网站的主页名称.(修改粗体表示的内容,其他内容不要改动)

# www.hostmonstercn.com
# .htaccess main domain to subfolder redirect
# Copy and paste the following code into the .htaccess file
# in the public_html folder of your hosting account
# make the changes to the file according to the instructions.

RewriteEngine on
# Change yourdomain.com to be your main domain.

RewriteCond %{HTTP_HOST} ^(www.)?yourmaindomain.com$

# Change ’subfolder’ to be the folder you will use for your main domain.

RewriteCond %{REQUEST_URI} !^/subfolder/

# Don’t change this line.

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

# Change ’subfolder’ to be the folder you will use for your main domain.

RewriteRule ^(.*)$ /subfolder/$1

# Change yourdomain.com to be your main domain again.

# Change ’subfolder’ to be the folder you will use for your main domain

# followed by / then the main file for your site, index.php, index.html, etc.

RewriteCond %{HTTP_HOST} ^(www.)?yourmaindomain.com$

RewriteRule ^(/)?$ subfolder/index.php [L]