Abstract:Entering into industry technology innovation strategic alliance is the consideration of enterprise development strategy,the complexity and the unscientific nature of the enterprise entering into alliance determine the necessity of the enterprise entering into alliance classification.Based on definition of enterprise size, division the time of enterprise entering into alliance and conclusion the way of enterprise entering into alliance, it makes qualitative three-dimensional classification of enterprises entering into alliance and the dimensional structure shows eight types enterprise entering into alliance.There are some differences in the motivation of enterprise entry because of different type of enterprise entering into alliance.For the obstacles during enterprise entering into alliance,such as obtaining incomplete information and imperfect mechanism of enterprise entering into and withdrawing from alliance,the article puts forward some corresponding improving countermeasure from three Angles of the alliance unit, the government and the enterprise.