Triggered positioning method, terminal, positioning server and system

The embodiment of the invention provides a trigger positioning method, a terminal, a positioning server and a system. The method comprises: receiving a common event trigger and obtaining event description according to the common event trigger; detecting the event; if the event is detected to happen, terminal position information is obtained through terminal positioning; transmitting terminal position information and the detected event. The trigger positioning method of the embodiment of the invention can support a custom event and can flexibly satisfy locating requirement from a position requesting party for various events. Under the condition of needing the positioning server to participate the positioning, the positioning server is only needed to transmit the event information to the position requesting party without perceiving the event itself, thus improving processing capacity of the positioning server.