Abstract: To further study the evolution process of the Songnan Low Uplift granite buried hill, the basement monzogranite in well Y8-A are analysed by chronology, major and trace, Sr-Nd-Pb-Hf isotopes, apatite fission track, and zircon (U-Th)/He methods. LA-ICP-MS zircon U-Pb dating is 235.6±4.8 Ma. The mafic dikes ⁴⁰Ar/³⁹Ar flateau age is 141.57±0.63 Ma. These granites belong to high potassium calc alkaline and peraluminous S-type granite. Their (⁸⁷Sr/⁸⁶Sr)_i, ε_Nd(t), and ε_Hf(t) values are 0.70793-0.70944, -4.45 to -6.39, and -5.6 to 1.5, respectively. The apatite fission track age is 66.3±5.6 Ma, and the single zircon (U-Th) /He particle age ranges from (82.05±1.99) to (45.93±1.14) Ma. The comprehensive study shows that the monzogranite was formed in the post-collision background after the collision between Indochina and South China. The thermal history inversion results show that the evolution of granite buried hill can be divided into five stages: emplacement, slow cooling, fast cooling, near-surface denudation and sediments burial.