Abstract: Water inrush，large areas of supports crushing，gas accumulation and other accidents disasters had been taken place 12 times during the excavation of 21301 initial mining face in Cuimu coal mine，Shaanxi province，China.Based on the study of the mining face roof strata structure，geological and hydrological conditions，the induced-pressure of the mining face and water inrush quantities，the full-seam mining height，layered fully-mechanized coal cutting height，top caving height and water-conducting fractured zone height were calculated to analyzed relationship between aquifer and water-conducting fractured zone.In addition，the upper limit of safe mining of full-mechanized caving mining was obtained to put forward the safety mining technology of the Cuimu coal mine at the initial and final fully-mechanized caving mining.This study provides guidance to preventing major disasters of coal face.