Wear analysis was carried out on the gearbox oil with hydraulic valve stagnation,and the characteristics of wear particles in the oil were collected and analyzed by ferrography analyzer.It is found that the size of the wear particles collected by the ferrography is small,and the collection capacity of non-ferromagnetic wear particles is weak.In order to achieve the analysis of large particle size and non-ferromagnetic wear particles in the oil,a comprehensive detection method for oil abrasive particles was proposed.In this method,the laser particle size analysis was firstly used to obtain the particle size distribution map of abrasive particles,so as to judge whether there are abnormal particles in the oil.Then the filter film spectrum technology was used to collect large size abrasive particles,and the optical microscope was used to preliminarily judged the wear type and type of particles.Finally the X-ray fluorescence spectrum analysis and scanning electron microscope energy spectrum analysis methods were used to determine the specific element composition of abrasive particles,and the type of abrasive particles.The results of case study show that this method can effectively determine the source of abnormal particle size in gearbox oil,the wear type and degree of parts,and also determine the material composition of abrasive particles.It provides a new method for transmission fault prevention and product improvement.