The Bengge gold deposit, which is located in the northern region of the Ailaoshan- Jinshajiang alkali- rich porphyry metallogenic belt, is a hydrothermal type gold- polymetallic deposit related to alkaline rocks in the Sanjiang area of southwest China. The collisional orogen of India- Asia plates occurring in the Himalayan made it multi- stage and composite mineralizations, but research on its metallogenic chronology of the deposit is still poor and restricts the understanding of metallogenic mechanism. Apatite fission- track (AFT) thermochronology technique is one of the most effective approaches to study the thermal evolution of mineralization in recent years. This study carried out the apatite fission track testing, and three groups of fission track ages of 30 Ma, 25 Ma and 15 Ma have been obtained. Simulation analysis reveals the main metallogenic thermal history of the Bengge gold deposit since the Himalayan epoch. The period of 42Ma～32Ma had a decreasing amplitude of 20～30℃, with a cooling rate of 3～3. 8℃/Ma; the period of 32Ma and 16Ma had a temperature decreasing of 20～10℃ with a cooling rate of 1. 5～0. 71℃/Ma; the period of 16Ma～6Ma witnessed a temperature decreasing of obviously 50～45℃, with cooling rate of 11～6. 25℃/Ma. The former two phases were in a slow decreasing of temperature, indicating a setting of squeezing and shorting. While the last was rapid cooling phase, indicating a extension- dominated tectonic activity. Fission track thermal history simulation reflects that the Bengge gold deposit has undergone two stages of metallogenic process. The first stage was in the environment of extrusion and shortening, which coincides with the tectonic background of compression and torsion in the Sanjiang area at that time; while the fission track age of 30Ma represents the formation time of major gold mineralization. The second stage reflects that the environment of tectonic extension is the same as the extensional setting in which the Sanjiang area was located. 15Ma is the specific time limit for mineralization, indicating that the metallogenic tectonic activity has undergone an evolutionary mechanism from compression to extension. Based on the fission track data for apatite and metallogenic simulation, this paper established the ore- forming thermal events of the Bengge gold deposit in the Himalaya period. The results in this study demonstrates that evolution mechanism of the Bengge gold deposit is similar to the main metallogenic event occured for the alkaline magmatic belt in Sanjiang area, and also shows that the Bengge gold deposit was part of the composite metallogenic system in the Sanjiang area in southwest China, suggesting that the two have similar geodynamic mechanism.