Abstract：A method to evaluate heliport clearance was proposed，based on AutoCAD VBA secondary development program conducted and heliport clearance principle.In the method，a model of the obstacle limitation surfaces for each military heliport clearance area and a program ware costructed，using VBA language.The pragam can generate flat map of each military heliport clearance area and obstacle clearance evaluation database automatically.The flat maps will show location of the obstacles in the military heliport clearance and clearance assessment results.The experiment showes that the method is simple，efficient,and easy to keep secrecy.Therefore，it is suitable to military heliport clearance assessment.
