apache环境下： 
修改伪静态规则配置文件 data/admin/ApacheRule.config： 

RewriteRule {topicDirName}/(.*?){fileSuffix}$ {topicDirName}/\?$1{fileSuffix}

修改为：

RewriteRule {topicDirName}/index(.*?){fileSuffix}$ {topicDirName}/\?$1{fileSuffix}

iis环境下： 
修改伪静态规则配置文件data/admin/RewriteRule.config： 

RewriteRule ^(.*)/{topicDirName}/(.+?)\{fileSuffix}$ $1/{topicDirName}/index\.php\?$2\{fileSuffix}

修改为： 

RewriteRule ^(.*)/{topicDirName}/index(.+?)\{fileSuffix}$ $1/{topicDirName}/index\.php\?$2\{fileSuffix}

最后删除根目录下已经生成的伪静态规则，重新生成即可