The"One Shoulder Pole"of village organization leaders has reached a consensus at the national policy level.However,how"One Shoulder Pole"affects the effectiveness of rural grassroots governance has been a controversial theoretical and empirical issue for a long time.Based on the micro-data at the administrative village level,this paper tests the impact of"One Shoulder Pole"and its mechanism.The results indicate that"One Shoulder Pole"of village organization leaders can improve the supply of rural public services.Through the triple supervision and restraint mechanism,the coordination function of"One shoulder Pole"helps to improve the efficiency of village resource allocation,promote the development of village collective economy,and thereby enhance the supply capacity of village collectives for rural public services;the control function of"One Shoulder Pole"reconstructs the rights and responsibilities of rural governance organizations,promotes the efficiency of rural public affairs management,and thereby improves the efficiency of rural public service supply.Furthermore,the positive impact of village party secretaries serving concurrently as village directors on the supply of rural public services is more obvious for administrative villages which are close to cities,have large population and high quality of village cadres.Finally,this paper proposes suggestions from three aspects:improving the design of the"One Shoulder Pole",optimizing the implementation strategy of"One Shoulder Pole",and improving the supervision mechanism of"One Shoulder Pole".