Multi-stage turbine aerodynamics optimization process was designed with the core of twisted S1 stream surface optimization,and the effects of film cooling air,trailing edge coolant,endwall coolant were researched on validity and reliability of the twisted S1 stream surface optimization. This process could advance parallel optimization for multi-stage twisted S1 stream surface with blade coolant in variety of blade height,which can improve twisted S1 stream surface optimization reliability. There were three ...