Abstract: It is very important that choosing the methods of exploration when we carry out geological work in areas whose surface is covered seriously.High-precision magnetic method is the preferred method of geophysical techniques for finding magnetic mineral,and this method played a very important role in geological prospecting work in Qimantage area.There are a large area of sand beams in the west of Nalingguole river,which are a few meters to ten meters in height.According to the data of bore hole,the overburden thickness is 160-314m.Trail are all covered by desert,and the ground magnetic anomaly is wide-gentle and unobvious.Lack of local geological data led to the interpretation of magnetic survey data is very difficult,and can not provide the exact location to verify bore hole.So the progress of magnetic anomaly interpretation plays a key role.This paper will illustrate examples of using the technology of joint inversion of surface and borehole magnetic data,in order to get more breakthrough in the desert coverage prospecting.