IT plays an important role in enterprises development. This study, evaluating enterprisesIT application, solve the problems as follows: understand enterprises IT applying degree, identify main influence factors of IT application, and hope to improve the ability of enterprises applyingIT.The significance of solving above problems can promote enterprises to apply IT better, advance enterprises developing and improve enterprises marketing competitiveness. In this paper, based on enterprises IT application data of Tianjin in 2011-2012,BP neural network analyzes the constructed index system of enterprisesIT application,evaluate and rank random 15 companies. The empirical results show that the IT application of enterprises in Tianjin has reached a certain level. The core innovation of this paper is to make sure the degree of applyingITis closely linked with applying software developing, system process integration and economic benefit. Compared with previous work, this paper selects main influence factors to improve IT application from management perspective, according to index weight and proposes a scientific and operable method, which has verified the consistent between evaluation result and practical result.