recently i am drivering traffic to my site from google adwords.according google Analytics,i Doubt that some traffic are fake,mainly comes from google network? How do you think about it?
Google has very sophisticated click fraud mechanisms in place. Of course it's not impossible to cheat it, but it's very difficult and would take a concerted effort. If you think a particular placement is cheating you, report them to Google. Otherwise, it may not be fake, just badly targeted. And that's in your hands.