Abstract: The rock sample will generate acoustic emission when the rock sample suffering the external or internal loading.AE technique is a good tool which is used to study the process of crack expansion.In this paper,AE technique was employed to study the failure process of granite samples under uniaxial compression loading,and analyze the AE activity of granite samples during the total loading process.The testing result indicated the AE events gradually increased with the strain changing.The Simplex technique was used to locate the position of AE events.From the result of AE location,we found the AE events distribute randomly in the initial loading.With the loading increasing,the AE events gradually congregated up to the rock failure.The AE events gradually increase with the time changing.After the granite samples failure the AE events continue to increase,which is mainly due to the internal stress achieving the new balance.From the result,we can conclude that AE events with time changing can be used to disclosure how to attain the new balance of the internal stress field after the rock sample marco-failure.