Prestack time migration can realize the fine imaging of geological structure and also provide a high resolution imaging section for lithological reservoir prediction.In order to apply the prestack time migration technology effectively to the coal seismic data processing,the authors,on the basis of the characteristics of coalfield seismic data,studied a series of prestack processing technologies,introduced the tomographic inversion method by using first arrival wave and reflected wave to establish fine migration velocity field,and built prestack time migration work flows and process measures which could be used to actual data.The actual data imaging results show that,compared with poststack migration method,the prestack time migration imaging result has greatly improved the imaging precision and amplitude preservation,which is helpful to the fine structure interpretation and lithological inversion of coalfield seismic data.