Free flying model test is used to obtain aireraft stall /departure ,initial spin to spin dynam.ics and modification method. The recovery section is the most malfinction and most serious stage.The composition and working process of the parachute system are analyzed. The key parameters suchas the structure of the umbrella, the area of the umbrella, the position of the umbrella cabin, the speedand the overload of the parachute are studied. In addition,combined with the characteristics of themodel free flight test, the redundant parachute control system is designed. The test results show thatthe system has high integration and high reliability ,and can greatly improve the probability of suc.cessful opening , and is suitable for popularization and application in the free flight test of subsequentmodels.