The invention relates to a content extension system based on a position, in particular to an online game extension system based on the position, comprising a mobile terminal, a base station and a server. The mobile terminal comprises a first display module, a first control module and a first communication module, wherein the first control module comprises a position initializing module. The server comprises a second communication module, a data processing module, a base station position database, a landmark position database and a user information database, wherein the data processing module comprises a position analysis module. The first communication module communicates with the server through the second communication module. By adopting the content extension system based on the position, the functions of acquiring the current position, searching around resource, extending the contents and the like are realized, thereby the invention brings great convenience for the lives of people.