The mode of a certain type aeroengine turbine blades under the condition of operating regime is analyzed by using the finite elements analysis (FEA) software ANSYS in consideration of influence factors from centrifugal field, aerodynamic field, temperature and thermal field separately. It is found that centrifugal field and temperature field are the main factors influencing the natural frequency by comparing the frequencies and mode shapes with those of stationary ones at room temperature. But they have less influence on the blades' mode shapes. And then, thermal-structure coupling modal analysis of the blades is conducted in consideration of the effects of centrifugal field and temperature field simultaneously. At the same time, natural frequencies and mode shapes of the blades are obtained in working condition. The conclusion obtained in this paper is of great significance and engineering practical value to the design, retrofit and use of aeroengine blades.