Through integrated study of crystallinity of authigenic illite and chemical constitution of authigenic chlorite,it is concluded that the Cenozoic paleogeothermal gradient is from 37.

This article uses both method of s of vitrinite-reflectance and apatite-fission-track to inverse its Neozoic paleogeothermal gradient evolution rules.

Through the analysis of vitrinite reflectance,inclusion and apatite fission track,paleogeotemperature and paleogeothermal gradient obtained in Late Mesozoic of Qinshui Basin show well coincidence with each other.

The simulated results are as follows: the paleo-geothermal gradient was higher than the current, it was about 4.

This paper restores the palaeogeotherm and palaeogeothermal gradient in Songliao Basin using several methods.

This article shows that the palaeogeothermal gradient of Mesozoic can be determined by the correspondence relationship between the crystallinity of illite and burial depth and diagenetic temperature,and that the original Cretaceous thickness and denudation quantity can be obtained either by vitrinite reflectance or the temperature getting from inclusion measurements,which can be well com.

Based on vitrinite reflectance,palaeogeotemperature and palaeogeothermal gradient are evaluated, palaeogeotemperature is higher than present geot.

The palaeotemperature evolution of Bayindulan depresion has been recovered with the method of vitrinite reflectance.

2℃/100m between Tertiary and Quaternary period because of the continuous uplift erosion and the decrease of the Terrestrial heat flow, which made the palaeotemperature begin to decrease at early Tertiary.