To study the influence of different bearing clearance on the angular transmission error of RV reducer,the characteristics of the angular transmission error as the combination forms of different bearing clearances are obtained through applying dynamics simulation work on a simulation model of RV reducer,which containing cycloidal gear profile modification,bearing clearance and nonlinear contact of gears. By analysis of orthogonal test on the basis of above,the sensitivity and influence law of the different bearing clearance on the angular transmission error of RV reducer are analyzed. Furthermore,the bearing clearance can be designed targeted by dimension tolerance control,which provides a useful reference for the design and manufacture of RV reducer.