Abstract: East Kunlun Mountains is located in the northern margin of Tibetan Plateau, and Aikeng is situated between Mid-Kunlun fault zone and South-Kunlun fault zone. Using apatite fission track thermochronology, the datings of five samples were analyzed, and they are (99±10), (103±9), (80±6), (98±6) and (65±5) Ma respectively. There are three stages of thermal history. The first stage (160.58 Ma) fits in with that the Qiangtang block and the Lhasa block squeeze the Eurasian plate, and the second stage (58.35 Ma) corresponds to the collision between India plate and Eurasia plate. For the last stage (35 Ma to now), because of the stable tectonic activity, it is considered that it is not affected by the thermal events of the Tibetan Plateau since Neogene. In accordance with the results based on the three stages of thermal history, the formular calculations for the five samples have their rock uplifts of 3374, 3283, 3230, 3157 and 3 278 m, the average rock uplift is 3 264 m, and the average uplifting rate is 0.038 mm/a.