Qian Xuesen is a true national pillar, national merit and national hero. He devoted his life to China's national defense construction. Science has no national boundaries, but scientists have national boundaries. Qian Xuesen used his actions to tell us what patriotism is. At the beginning, when Qian Xuesen returned to China, he was strongly opposed and obstructed by the US government. Even so, Qian Xuesen overcame difficulties and resolutely returned to China to build a new China.