Due to the popularization of Internet and World Wide Web (WWW), thelimitation of distance and region are broken for business behaviors.At same time, E-Commerce becomes one of the most importantapplications on Internet. E-Commerce can help a company or enterpriseto extend its market place to unlimited region. Agent technique is oneof the important technologies developed to support the Internetapplications. Especially, the Internet and WWW technologies broken thelimitation of space of enterprise marketing, and the agent techniquessolve the problems of temporality. Because of when the users areoff-line, the agents are still active in the world of computer networkand play the role of their users. In this paper, agents and mobileagents mechanism are proposed for electronic marketplaces. There aresome issues will be researched. They include the platform of mobileagents, the types and classifications of agents and mobile agents,authentication and security, ...etc. Based on this architecture ofE-marketplace, the applications of E-commerce will be more effective,easier to develop, and more creating the marketing of business.