Based on the working characteristics of the long-endurance UAV(unmanned aerial vehicle)

and in combination with the power output characteristics of the engine and the power absorption characteristics of the set propeller

as well as external characteristic curve of the engine and propelling characteristic curve of the propellers

the method for matching of set propeller of the two-stroke piston engines was presented.This indcates that this method can be employed practically to select most suitable set propeller for one two-stroke engine under the conditions of ground and low altitude.