I am an advertiser, i want to use cpm to bring more traffic, could anyone give me some suggestions?
euros4click.de try for DE traffic
ValueClick Media is actually surprisingly good for skyscrapers and rectangle banners.
Google Adsense is probably one of the best, but probably cost you a bit more than some other CPM networks.
I would try any of these networks
google adsense
valueclickmedia
tribal fusion
casale media
burstmedia