Abstract: According to the contradiction between the pressure balanced ventilation system and the transportation system during the late mining period and the equ ipment removing period existed in the pressure balanced ventilation system of easy combustion fully mechanized coal mining face in Majliang Mine, With the local opti mization and improvement, a parallel operation could be conducted and was applied to No.8509 easy combustion coal mining face in No.305 mining block of No.14-3 se am.The results showed that after the ventilation system optimized and improved, the income ventilation of No.8509 coal mining face increased from the previous 680 m 3/min to 800 m3/min, the air retuning increased from the previous 278 m3/min to 790 m3/min and the pressure releasing and air leakage was highly reduced.The CO vo lume fraction in the upper corner and the air returning gateway reduced from 192x 10-6 to 0.The equipment removing work of the coal mining face was completed with 1 8 days only.