In order to reduce the feeding resistance of aircraft gun weapon system, according to the characteristics of certain type helicopter weapon platform, a spherical hinge flexible guidance based on the principle of chainless feeding is designed. The basic structure and working principle of the ball-and-socket flexible guidance were analyzed, and the mathematical simulation model of the motion and force of the closed belt in the flexible guidance was established, and the guidance structure was optimized according to the analysis results. The change of motion resistance of the flexible guidance under different working conditions was tested by experiments, and the factors affecting its working performance were analyzed. The results show that the feeding resistance of the gun weapon system can be effectively reduced and the feeding reliability can be improved by using the rigid and flexible spherical hinge flexible guidance.