Abstract: It is a new attempt to study mineralization age using fission track method. The fission track ages of zircon and apatite from mineralizing magmatic cryptoexplosion breccia in Hongshuihe gold ore district, eastern Kunlun Mountains, are 193.7 Ma and 150.9 Ma, respectively. The mean fission track length in apatite is (9.6±3.2) μm. They reflect the ages and characteristics of mineralizing thermal events in accordance with geological setting. Forward model based on apatite fission track analysis indicates this ore district went through 3 hydrothermal alterations at lest and about 100 Ma mineralization duration, in which there was higher temperature in the early than in the late.