Abstract: The Yulong porphyry copper deposit is the only super-large porphyry deposit in the Yulong porphyry copper belt, and the previous research on this deposit is primarily focused on genesis, with limited emphasis on the significance of post-metallogenic transformation in formulating prospecting strategies. Thermochronological methods such as zircon U-Pb, apatite fission track, apatite and zircon (U-Th)/He were employed to date and conducted some related thermal history inverse modellings. The results indicate that the zircon U-Pb concordant age of the monzogranite porphyry of the Yulong deposit is 41.7±0.5 Ma, with zircon (U-Th)/He age ranging from 34.9 to 39.3 Ma, indicating that the magmatic-hydrothermal evolution process of the Yulong deposit may have lasted at least 5 Ma. The apatite fission track ages ranging from 34.7 to 19.7 Ma, while apatite (U-Th)/He ages is range from 20.7 to 18.4 Ma. These sequentially decreasing ages are indicative of the timing of cooling and exhumation events. The inverse thermal history modelling indicates that the Yulong deposit has undergone a roughly three-stage cooling process, combined with the regional tectonic evolution data, the relatively rapid cooling between 35 and 30 Ma may be related to the rapid uplift of the Qinghai-Tibet Plateau, resulting from the ongoing collision between the India and Eurasian continents during this period. The relatively slow cooling observed between 30 and 22 Ma could be linked to the weakening of collision activity; The relatively rapid cooling between 22 and 10 Ma may be associated with the crustal thickening event in the North Qiangtang terrane, triggered by tectonic shortening or magma inflation during this period. Utilizing the thermal history simulation method, the exhumation amount of Yulong deposit is 3.45 km, Considering the metallogenic depth of 4~5 km of Yulong deposit, there is still 0.5~1.5 km of prospecting space in the deep part of the deposit.