Abstract: The YS1 area in Sichuan basin has undergone multiple stages of tectonic evolution.The faults are characterized by multiple stages and multiple strikes,and serious mud losses occurred in the drilled well.It is difficult to finely characterize fracture and analyze structural development when the conventional seismic interpretation method is used.In this study,according to the actual situation,ant tracking technology was used to predict fractures,whose accuracy was improved by noise reduction,continuity enhancement,fault boundaries height,and fake structures elimination.The process is as follows:firstly,the input seismic data volume is pre-processed by structure-oriented filtering and discontinuity detection,then the ant tracking parameter settings are optimized,and finally the ant tracking under the occurrence control is performed.The data can not only be used to assist fault interpretation but also provide a data basis for subsequent fault development analysis and horizontal well location deployment.