In view of the influence of running-in method on the overall efficiency of swashplate plunger motor,through analyzing the factors affecting the overall efficiency of the motor,five newly assembled motors were tested.The tests were divided into three groups.The influence of running-in only in forward or reverse direction on the overall efficiency,the influence of only running-in with large or small displacement on the overall efficiency,the influence of full running-in of forward and reverse rotation on total efficiency under large and small displacement,were analyzed respectively.The test results show that:under the test method,if only forward or reverse running-in is carried out,there is a deviation in the total efficiency of forward and reverse rotation after a period of time,the deviation value is from 2% to 3%; if only large displacement forward and reverse running-in is carried out,the total efficiency under large displacement will reach the maximum value after a period of time,while the total efficiency under small displacement will be slightly less than the maximum value,with the difference less than 1%; if only small displacement forward and reverse running-in is carried out,the result will be opposite; if the full running-in of forward rotation and reverse rotation is carried out under large and small displacement,the total efficiency is basically close to the maximum after 12 min of running-in,and the total efficiency has stabilized after 24 min of running-in.Therefore,it is suggested that before testing the overall efficiency in the factory test,it is necessary to conduct a full running-in of forward and reverse rotation under large and small displacement according to the running-in method in the industry standard Hydraulic Motor (JB/T 10829—2008).The total running-in time is not less than 12 min.If you want to measure the overall efficiency more accurately,the total running-in time is not less than 24 min.Different motors may have differences.