An unpowered dynamic similarity scaled aircraft model under different conditions, such as different configurations, different centre of gravity locations, different weight, different simulated flight altitude, was tested in Ф5m vertical (spin) tunnel in first time to investigate the spin characteristics of a large civil aircraft (large aspect ratio, backward sweep wing, wing mounted engine). The results show that the spin characteristic of this aircraft was quite favorable. The spin motion of aircraft model was quite stable. Rotation direction of the model was not changed in spin motion, and rotation rate was quite low. The best spin recovery technique was to fully reverse rudder and fully forward the stick simultaneously, quickest recovery of the spinning model was within 1 second or no more than half circle. This spin recovery technique is easy to operate, which is suitable for large civil aircraft. Moreover, the most favorable parameters of the antispin parachute was obtained by model freespin tests.