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The study of apatite fission track suggests that the early Cretaceous deposits in the Liupanshan basin were subjected to two burial heating events. The first heating event occurred during Cretaceous time and reached the maximum temperature prior to the end of Cretaceous. The second one occurred during Eocene‐Late Miocene and reached the maximum temperature at about 8MaB.P. The first maximum burial temperature is higher than the second one. The Cretaceous Naijiahe and Madongshan Formations have lain in the “oil generation window” temperature range, but the maximum temperature is lower than the oil generation peak temperature. The maximum temperature to which Triassic‐Jurassic hydrocarbon source rocks were subjected is higher than the oil generation peak temperature. According to the geothermal results, the Triassic‐Jurassic strata may be the predominant hydrocarbon source rocks in the Liupanshan basin. The predominant hydrocarbon generation occurred prior to the late Cretaceous.