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My business is travel tours. So my tours often have duplidate a part of contents. ex: i have 1 tour with content: day 1: blabla day 2: bla bla.... the 2nd tour is include tour 1 and 1 day more so i often have duplicated content. But i have no way to avoid it :((

Thank you very much.

thanks both of you! Because of i can configure the meta robot tag so i must use robots.txt :(( I wil check in Google webmaster tool!

You can use 301s or canonicals even if it's driven by one template. You'll have to set up the 301 rules based ont he URLs themselves or create dynamic caonical tags in the code. if the CMS can drive multple URLs, it can drive multiple canonicals. If you can't sort that out in the code, you can't use NOINDEX either. You'd end up no-indexing every version. Your other best bet may be to ignore the ID= parameter in Google Webmaster Tools. Personally, I consider that the worst of the three options, but it is the easiest and it should help a bit.

Your meaning that they can not attack me by spam links? ( i found that they add my link on adult webpage). So i think i should remove it from my backlink list. Yes, i think that the link exchange page is not good way to building link because of many reason and it is not my main way to building links. But now, my webpage is in google Sanbox and i must escape from it before i am building good links.

Thank you!

I'm not sure what the "id=" parameter is doing, functionally, but there are many ways to control it, and Robots.txt is probably not your best bet. You could META NOINDEX the duplicates, or you could rel=canonical to the "master" page. It's a complex subject, and I've got a comprehensive post about it here: http://www.seomoz.org/blog/duplicate-content-in-a-post-panda-world Those duplicates can definitely dilute your ranking ability, and even trigger a Panda problem (that could harm your entire site). I don't believe there's really a sandbox in 2012, in the way we used to mean it. Many sites go out the gate ranking pretty quickly. Sometimes, after an initial grace period (30 days or so?), Google lowers a site's ranking, but that's usually because they re-evaluated the link profile. Large-scale duplication wouldn't cause that. The good news is that, once you clean it up, rankings should gradually improve.