On the base of analyzing the reasons of coal lose in fully mechanized top coal caving,a irregular fully mechanized top coal caving face along with fault was designed,a safety technology of adding or removing brackets and the former or tail slide groovy of transporter for the working face were innovated.This safety technology has ensured the normal production of the caving face,reduced the triangle coal lose and increased the recovery rate of coal,realized the safety and high efficient of the irregular fully mechanized top coal caving face.