Ram-compressed rotor of rotating ramjet has the functions of compressing air and combusting and doing work by exhausting, and it works in the environment of high speed, high temperature and high pressure, so the strength of ram-compressed rotor is important to security of engine as it is affected by mechanism-air powered -thermal force coupling. The method of joining ADAMS and ANSYS to accomplish mechanism-air powered-thermal force coupling analysis of ram-compressed rotor is adopted, gained main factors which affect on strength of it, which provides advantageous basis for structure design and improvement of ram-compressed rotor.