Under the action of complex and variable loads,the blisk is prone to vibration damage and shortening its service life.To solve this problem,taking the simplified model of the blisk as the object,the pressure surface of the blade was coated with NiCrAlY hard coating,and the flow field model of the blisk was established;the fluid structure coupling method was used to simulate the aerodynamic load on the surface of the blisk without hard coating and with hard coating respectively by using Fluent software;finally,the prestressed modal analysis method was used to solve the vibration response and equivalent stress distribution without hard coating and with hard coating blisk under aerodynamic load,centrifugal load,aerodynamic and centrifugal load,and the Campbell diagram of blisk was drawn.Based on the above results,the effects of hard coating and three load modes on the vibration characteristics of blisk were compared.The results show that the hard coating has little effect on the vibration characteristics of the blisk;compared with centrifugal load,centrifugal and aerodynamic load have more significant influence on the vibration characteristics of blisk;hard coating can reduce the number of resonance points of the blisk.