The geothermal history of strata or rocks has been qualitatively and semi-quantitatively in Shiwanshan basin and its neighbouring region

based on analyses of fission-track apparent age and modelling of confined track lengths distribution of apatite samples.The results show that all samples have experienced paleogeotemperatures of over 60～70℃;the basement strata(T

1

b) on the northwestern side of Shiwanshan basin have been uplifted and denuded to the near-surface (with a paleogeotemperature of below 70℃) much more earlier than the basement rocks(γ

5

1

)on the southeastern side of the basin and the paleogeothermal history of samples from the basin can be divided into six stages

they are the fast burial and increasing temperature(T

3

-J

3

)stage

transient decreasing temperature(latest J

3

-early K

1

)stage

burial and increasing temperature(K)stage

rapid decreasing temperature(last K

2

-E

1

)stage

relatively stable (E

2

-E

3

)stage and another rapid decreasing temperature (since N

1

)stage.