However, the regularity of mechanical properties and fracture morphology is poor. In this paper, the lithofacies characteristics of conglomerate reservoirs in Mahu depression are classified, and the mechanical properties, fracture characteristics, meso mechanical properties and other aspects are studied. The following conclusions are drawn: the gravel content and the strength of the complex foundation are the main controlling factors of the mechanical properties. The higher the gravel content and the smaller the strength of the complex foundation, the smaller the uniaxial compressive strength and elastic modulus of the conglomerate. The reservoir of Baikouquan formation in mahu-1 well block is calcareous cementation with high strength of heterobase, and the expansion of fracture network is controlled by surrounding gravel and crossing gravel, so it is easy to form complex fractures; the reservoir of upper Wuerhe formation in mahu-1 well block is argillaceous cementation with low strength of heterobase, and the formation of fracture network is dominated by deformation of heterobase, so it is not easy to form fracture network; the reservoir of Baikouquan formation in mahu-131 well block is calcareous cementation with the largest strength of heterobase and the largest strength of fracture network It is easy to form complex fracture network. Based on the above analysis, the upper Wuerhe formation in Mahu 1 well area is argillaceous cementation, which is prone to hydration during fracturing and further reduces the strength of miscellaneous foundation. Therefore, the formation of main fracture should be the main target of reconstruction, while the Baikouquan formation in Mahu 1 well area and Ma 131 well area should improve the complexity of fracture network while forming main fracture.