Taking the simplified model of an aero-engine blisk as the research object，the NiCrAlY hard coating was coated on the blade surface and the dynamic model of the blisk was established. The modal analysis was carried out to study the effects of only considering centrifugal force and considering centrifugal force with Coriolis force under different working conditions; the effects of centrifugal force and Coriolis force on the modal characteristics of the hard coating blisk at different speeds were studied， and the effects of hard coating on the inherent characteristics of the blisk was discussed.Finally，Campbell diagrams under two different loads were obtained based on the calculated natural frequencies，and the dangerous rotational speed of the hard coating blisk was obtained. The results show that the higher the rotational speed is， the higher the natural frequency value is，and the greater the influence of Coriolis force on the frequency characteristics is. The hard coating has little influence on the frequency of the blisk system，while the hard coating weakens the influence of Coriolis force. For the blisk system with high speed rotation,the Coriolis force influence is significant and cannot be ignored in engineering calculations.