As the core moving part of the landing gear retraction system， the dynamic performance and wear characteristics of the aeronautic low-speed heavy-load spherical plain bearings with self-lubrication directly determine the mechanism reliability. In order to test the comprehensive performance of the spherical plain bearing on the actuator cylinder of a landing gear retracting mechanism， the dynamic parametric model and joint wear model of the retraction mechanism with clearance are established in this paper， and the wear depth of the liner is predicted by numerical simulation. Then， the spherical plain bearing with the landing gear retraction bench test is carried out， and the special test bench is designed to test its key performance parameters such as starting torque under no load， liner wear， and friction torque under heavy load. The results show that the prediction accuracy of the wear model is more than 95%. The spherical plain bearing shows good service performance under the actual load spectrum， and no abnormal wear or stagnation occurs in 12 500 retraction cycles， which can meet the stringent requirements of the landing gear retraction mechanism.