Abstract: The establishment of the bedrock geological model with gravity anomaly data in the covered area usually requires a lot of geological and rock-physical data.The results are often disturbed by geological prior information and human factors.A joint inversion method of gravity anomaly and borehole data for constructing the geological bedrock model in shallow overburden area was introduced to explore the feasibility of rapidly and efficiently constructing the geological model of bedrock surface undulation, fault distribution and density distribution in the case of less human intervention.In the practical application of the Tanlu Fault Zone, Sihong area, the wavelet multi-scale decomposition method was used to extract the gravity anomaly field of bedrock surface; furthermore, the geological model of bedrock in this region was constructed by means of wavelet fault analysis, linear regression inversion and apparent density mapping.The results show that this method can construct the geological model of overburden area quickly and efficiently without requiring a lot of geological prior information.This model can truthfully reflect the structural and physical characteristics of the bedrock surface, and refine the regional tectonic characteristics of the Tanlu Fault, which is meaningful for the better understanding of the regional tectonic evolution and geophysical data inversion of buried bedrock.