The reliability of Aviation four stations gas support equipment is improving constantly, but gas support process of the accident is still happening. STAMP regards safety as a matter of control, believing that the accident is caused by unreasonable control and inaccurate information feedback. This paper first introduces the working mechanism of STAMP / STPA, and then constructs the STAMP model for Aviation Four Stations Gas Support Process. The STPA safety analysis method is used to analyze the safety of the Aviation Four Stations Gas Support Process and identify the unsafe control action, the scene analysis of the generated unsafe control behavior is performed, and finally the comparison with Accidents Tree Analysis (ATA) is carried out to confirm the superiority of the method.