That is necessary to simulate effects of propeller power, when the Aircraft with propeller is considered stall performance by scaled free-flight test. Combined with the analysis of simulate methods propeller power and criterion of dynamic similitude for modeling flight, and advanced the simulation method of propeller aircraft were investigated the stall, spin and recovery characteristics by free-flight test. Actual free-flight tests were performed to examine the method on four turbo-prop engines. The free-flight test results shows that the method real reflected the state of propeller power operation at the stall, the stall speed and stall characteristics were exactly obtained on influence of propeller power for full-size aircraft.