With the continuous progress of bearing manufacturing technology,grease gradually becomes an important factor affecting the noise performance of precision bearings.For different stages of bearings running,the noise value of grease in the start-up stage of bearings,the noise level,vibration value and damping value in the middle and high frequency bands during the running stage of bearings were evaluated by using BeQuiet+ tester.The evaluation results of BeQuiet+ tester were compared with those of S0910-Ⅲ bearing vibration tester.It is found that for greases with large difference in noise performance,the test results of the two instruments have the same trend,while for the greases with small difference in noise performance,the test method of BeQuiet+ tester has better differentiation.An evaluation method for the noise performance of precision bearing grease using the BeQuiet+ tester was established,and the evaluation method was validated using six greases with different impurity particles and microscopic morphology.This evaluation method focuses on the noise performance during the whole operation stage of the bearing and the stability of the noise during operation,which can better distinguish the noise performance of the precision bearing grease.