Firstly, data collection of different spin characteristics of fixed wing aircrafts under the different test technology and conditions was carried out widely, and several important empirical conclusion were taken through analysis and comparison. The initial spin characteristic of aircraft A was predicted based on the spin characteristics of some other aircrafts which have got the similar layout. Further, according to the theory of moment equilibrium when aircraft is at the state of fully developed spin, the angle of attack and nondimensional rotation speed of aircraft were predicted by using intersection method. Finally, the prediction was confirmed by the results of spin tunnel experiments, and a dynamic similarly scaled aircraft model was used. The test results confirm the rationality of the prediction method.