The banking industry，as the main body of financial market in China，lay great emphasis on the innovation and upgrading of its information service that result from the mutual promotion and integration of banking industry and information technology. Information technology can do banks a favor in identifying customers efficiently，promoting the sale of financial products，lowering the operation risk and cost. Simutaneously，the demand for information technology during the application encourages the development and innovation of information technology. This chapter studies the mutual protomotion relationship between banks and information techonology and service development. Then we explore the current situation of the combination of banking industry and information techonology industry and analyze the circumstance of cooperation between banks and internet technology finance corporations in China. Finally we elaborate the existing problems of the development of information technology service in China's banking industry and propose the advancement approaches corresponded.