What contribution did Qian Xuesen make after returning to China?

It has laid a solid foundation for China's space industry. Make a fundamental contribution to China's military hi-tech.

Participated in the formulation of the two-bomb combination test of China's short-range missiles carrying atomic bombs,

Participated in formulating the development plan of China's first interstellar aviation,

With the development and establishment of engineering cybernetics and systematics, it is advocated to determine the macroscopic mechanical properties of substances from microscopic laws, which has opened up a new field of high temperature and high pressure.