I installed lighttpd-1.4.28 to serve static files,but I want to add mintype (html) on specific folder not all document root how, can do it ?
I'm not familiar with mintype but lighttpd's conditional config file stuff is quite powerful. Take a look at this URL under "Conditional Configuration" : http://redmine.lighttpd.net/wiki/1/Docs:Configuration
Specifically, you can make a config block apply only to a certain URL regex.
In your case you could try