Since 2020，3D development with deploying adjustment wells between wells in the upper，middle and lower layers has achieved good results in some well group tests of Fuling Shale Gas Field，which is expected to improve the overall recovery of the whole play. Adopting the numerical simulation method to evaluate the development effect of different technical schemes for shale gas 3D development is the basis for further optimizing the scheme and improving the overall recovery.Accordingly，this paper proposes a numerical simulation method based on an embedded discrete fracture model. Taking the Fuling Jiangdong Block as an example，the paper comprehensively analyzes the influence of factors such as results of different fracturing technologies and inter-well interference on well group productivity. It also evaluates the effects of 3D development and proposes corresponding countermeasures for stabilizing and increasing production. The results indicate that the embedded discrete fracture model can depict the distribution of fracture networks in multi-layers with 3D development of horizontal wells and simulate the interference of fractures. There are not effectively producing and basically unproducing shale gas reserves in the lower and the upper layers respectively，which are the potentials of infill adjustment. 3D development can effectively improve the production of shale gas reserves.