Abstract:As a basis for the formation of innovation, cloud computing provide a strong platform for knowledge sharing,this article is based on this background, studying IT Enterprise knowledge sharing from the view of the cloud innovation's low-cost、personalized、service、public property and cognitive, building the innovative knowledge sharing model for IT Enterprise knowledge sharing and using 344 effective samples data for research hypotheses. The study shows that cloud innovative low-cost、personalized、service、public property、cognitive performance can effectively promote the realization of IT enterprise knowledge sharing, cloud innovative platform can promote the effectiveness of knowledge sharing;making the point that IT enterprise achieve knowledge sharing by strengthening the promotion and application of cloud innovation、building cloud management system、spreading cloud knowledge and building a culture of innovation cloud;at last this article put forward the ways and significance of providing public cloud services by the government.