In this paper,first,the transmission principle of a new- type transmission mechanism,namely a planetarymechanism with multi- tooth meshing,was investigated. Next,based on the transmission principle, the influences ofeccentric error,gear phase angle,elastic deformation and load on the transmission accuracy of the mechanism wereanalyzed,and a model was established to describe the transmission accuracy varying with the angle,with the corre-sponding transmission accuracy equations being also deduced. Then,the virtual prototype technology was adoptedto perform a simulation and verification in ADAMS,and a simplified experiment was finally conducted to obtain theoutput angle error and the rotation error of the mechanism. It is found that the simulated results accord well with themathematical ones,and that the transmission accuracy of multi- tooth meshing mechanism is much higher than thatof the traditional planetary mechanism.