The invention relates to the technical field of mobile terminal technology and discloses a method and system for inquiring position information of a mobile terminal. The mobile terminal receives a position inquiry request input by a user, creates a first short message according to the position inquiry request, and sends the first short message and an ID of the mobile terminal to a server, where the message header of the first short message has a corresponding code that is used for identifying the position inquiry request. The server interprets the first short message to obtain the position inquiry request, obtains the position information of the mobile terminal according to the ID of the mobile terminal, creates a second short message according to the obtained position information, and returns the second short message to the mobile terminal, where the second short message contains the position information in a system-defined format.