Abstract:The grey selfincidence matrix of physicochemical index and elements content of spectrum analysis in oil monitoring of wind turbine was constructed to analyze the correlation of kinematic viscosity at 40 ℃,total acid number,water content,pollution NAS grade,iron,silicon and phosphorus elements.The research shows that the change of total acid number and kinematic viscosity of the gear oil of wind turbine is directly caused by oxidation deterioration,and they possess the strongest grey correlation.The hydrolysis of phosphorus additives is accelerated by water,and the acid number is enhanced.The oxidation products unfiltered affect the pollution grade and acid number of gear oil.The grey correlation of iron element content and total acid number is also strong due to their interaction.Effect of silicon element on iron element content in oil is the most because of wear.Selfincidence matrix constructed can provide the theoretical basis for lubricating fault diagnosis of wind turbine.