Abstract: According to great dust problems occurred from a mine mechanized heading face during mining process,a ventilation system ofthe mechanized heading fac e was established based on a spiral flow ventilation in a lab. The paper had a study on a medium pressure of thespiral flow ventilation system,the air pressure and suction mouth location of the air pressure and suction duct,pressure and suction ratioand other key influence factors affected to the dust fall efficiency of the mine mechanized hea ding face. The study results showed that thespiral flow ventilation of the mine mechanized heading face could form a basic closed spiral flow air curtain in a full roadway cr oss sectionand could effective prevent dust expanded to other region. When a pressure and suction ratio was at a certain level,to properly and in a cer-tain scale increase t he pressure air volume and suction air volume could be favorable to improve the dust fall effect of the spiral flow venti-lation system. As for the mine roadway with a cross section of 12 m2. The reasonable distance of pressure and suction mouth of pressure andsuction duct to heading face would be 17 m and 2 m. The rational pressure and s uction ratio would be 0.9 ~ 1. 2.