Abstract: On the basis of preview associated with basement research progress and the problems about Junggar basin, the crust in this basin is divided into three structural layers including sedimentary cap rock, Palaeozoic folded basement and crystal basement, according to the deep exploration results which include 4 exploration profiles by method of DSCW and one seismic reflection/refraction profile and inversion of gravity and magnetism, ascertaining B, G, C₁(or G₁), C and M interfaces with their parameters. The 3D model results show that the folded and crystal basement has "double basement" feature, belonging to continental crust. The present structure is buried shallower on the eastern, northern and western sides of it, and its middle part runs dip and deep from north to south. The thickness of folded basement is thicker in the north than in the south. The thickness of Sangequan swell is about 4~10 km in the north and 0~4 km in the south, and Changji sag is the thinnest between 0 km and 1 km. NWW-trending Kelameili-Wulungu upper mantle uplift, SN-trending Karameli-Zhangbei and Zayier-Sikeshu upper mantle uplift as well as sags and slopes in Junggar basin are all presented in this paper.

Key words: Junggar basin, folded basement, crystal basement, continental crust, crust layer