Qian Xuesen proved by actions that children don't think their mothers are ugly and dogs don't think their families are poor. This seems to be a very simple moral character. How many people can actually do it? Qian Xuesen gave up the excellent customs, high welfare and high treatment in the United States and resolutely returned to the poor motherland to repay the upbringing of the motherland. This selfless dedication and lofty personality charm are incomparable to contemporary scientists, which is also his greatness.