Abstract: Microseismic monitoring is very important for hydraulic fracturing; moment tensor inversion is the main method to identify the breaking trend of induced fractures.Firstly,the generalized reflection and transmission coefficient method is used to model seismogram and moment tensor inversion is used to characterize the source attributes.Then,the linear equation group of observation records and moment tensor are solved to inverse the source mechanism,from which the strike,dip and other parameters of induced fractures are obtained.All the information provides the criteria for hydraulic fractures interpretation and fracturing evaluation.The forwarding and inversion results of theoretical model and actual microseismic data prove the effectiveness of the method.