San Qian refers to Qian Xuesen, the father of Chinese missiles, Qian Weichang, the father of modern mechanics in China, and Qian Sanqiang, the father of China's atomic bomb. Qian Xuesen, Qian Weichang and Qian Sanqiang are called San Qian. These three are all great scientists in our country. There is no relationship between them, and they are not relatives.

Mr. Qian Xuesen is an academician of China Academy of Sciences and China Academy of Engineering, the founder of manned space flight in China, and the winner of two bombs and one satellite meritorious medal.

Mr Qian Sanqiang is a nuclear physicist. He is the founder of China's atomic energy science, the founder of two bombs and one satellite, and an academician of China Academy of Sciences.

Mr Qian Weichang has made great achievements in the fields of elasticity, variational principles and perturbation methods. He is also good at mathematics, physics and mechanics, and Chinese informatics.