Under the background of local governments advocating the construction of "digital cities", Aladdin independently developed 3D simulation cities and took the lead in putting forward a new concept of Internet application - e-city. As an online interactive city platform for 3D simulation, E-City is realized based on WEB GIS and virtual reality technology. It uses network topology method and database management system DBMS technology to conduct mathematical modeling for coordinate storage, positioning, search and attribute information access of urban entities. The use of 3D panoramic image technology, graphics engine model technology, SMS SM instant interaction technology, through the three-dimensional real scene simulation performance, seamless integration of urban electronic map, three-dimensional electronic yellow pages, life information, e-government, city e-commerce, city friends, virtual community and other service content. The platform is a new humanized WEB interface performance, providing convenient solutions for urban people's life, work, travel, travel reference, online service, online entrepreneurship and other activities; For the city government organs, public institutions, businesses and enterprises to provide a fast channel for public publicity interaction, so as to more convenient to achieve e-government, map query, yellow pages query, e-commerce, promotion and other social and economic activities. When people participate in these network economic activities, they retain the memory fragments of the process, so that the technology application of GIS and virtual reality is civilianized, so as to truly realize the online "digital city", so that people really feel that they live in an informationized city. The successful launch of E-City in Hangzhou, as the world's first three-dimensional simulation of online interactive city, has opened a new chapter in the history of the application of the Internet.