Hi! I know that couchcms its really easy to use but i am thinking in to use one couch base and use it for any html template without need to write every couch tag again. Its this posible? How do you use couch for build web site client?

I think what you're looking for is the concept of clonable pages.

Have a read through
http://www.couchcms.com/docs/tutorials/ ... /blog.html

- this will allow you create a page template, and then reuse it over and over to create the rest of the website.