Abstract: Aero-engine is increasingly to face the trend of higher load， efficiency and reliability， so that multi-field coupling problems are taken more and more attention. This research took the semal system of an aero-engine compressor as the research object， 3D flow field in the single sector and structural models were established by the method of cyclic symmetric. Considering the influence of former stator wakes， compressor flow field was simulated. Based on the Kriging model， load transfer of aerodynamic pressure and temperature achieved from flow field to blade structure. Then the coupling effects of aerodynamic pressure， temperature and centrifugal stress on compressor fatigue life were discussed. The results show that the load transfer with the Kriging model can meet the requirement of multi-field coupling dynamic calculation. In the low pressure compressor， centrifugal force plays a major role on deformation and stress of semal system， and bending stress induced by aerodynamic pressure and temperature can counteract part of bending stress induced by centrifugal force. However， temperature load makes the maximal deformation of blade-disc system increase.

Key words: compressor rotor, cyclic symmetric method, Kriging model, multi-field coupling, dynamic characteristics