Ⅰ. Introduction merce (E-Business) is in works, including between enterprises (B2B), business and consumers (B2C) commercial transactions, compared with the traditional business model, merce with efficient, convenient, covered wide range of characteristics and benefits. However, merce open this -based data exchange is great its security vulnerabilities, security is a core merce development constraints and key issues. In this paper, the basic ideas and principles of systems engineering, analyzes the current security threats facing merce, in this based on security technology from the perspective of development trend of merce. Ⅱ. merce model Modern merce technology has focused on the establishment and operation of work of stores. Network in the department stores and real stores no distinction between structure and function, differences in their function and structure to achieve these methods and the way business operate. Web store from the front view is a special kind of WEB server. WEB site of modern multimedia support and a good interactive feature as the basis for the establishment of this virtual store, so customers can, as in a real supermarket pushing a shopping cart to select goods, and finally in the checkout check out. These online stores also constitute the three pillars of software: catalog, shopping cart and customer checkou