Electronic commerce is a great revolution in human economic development.It has changed traditional business model and has been greatly developed in the 21st century by utilizing computer and digital tools.For the E·commerce,one of the major concerns is electronic fund transfer,and the other is online payment security.
From the technical level, the existing online payment system is studied in this article .First it introduced the development of E-commerce in China,then analyzed the infrastructure of online payment system,Beside, combined with existing network information security technology designed Digital cash, bank card, digital check payment system.