Based on the Archard wear model,the wear model of polymer composite gears was established.The meshing characteristics of viscoelastic polymer composite gears were analyzed,and the testing principle of polymer composite gear wear was discussed.A test system of the wear of polymer composite gears was designed.The testing principle of the system is that the gear is loaded dynamically by the cantilever beam supported by a single hinge through the pivot box,which causes the wear of the gear teeth surface and leads to the rotation of pivot box.By measuring the deflection angle of the pivot box with the displacement sensor and based on the relationship model between the deflection angle and the wear amount,the wear amount of the gear is obtained.The fatigue wear test of nylon 66 gear was carried out on the test system designed.The experimental results are in good agreement with the theoretical model calculation results,which not only verifies the correctness of the theoretical model,but also provides a new method for the wear test of polymer composite gear.