Qin Shihuang was an important figure in Chinese history. He unified China, established the Qin Dynasty, unified the writing system and the system of weights and measures, and implemented a series of important reforms. However, his war of unification brought great destruction to China and accelerated China's fall. His tyranny and policy of burning books and burying Confucian scholars had aroused people's disgust and criticism. Emperor Wu of the Han Dynasty was a great emperor in Chinese history. He implemented a central system, strengthened the country's ability to govern, strengthened the expansion and influence of the Han Dynasty externally, and implemented strict system norms internally. However, his policy of only respecting Confucianism had led to a rigid and closed ideology, which also limited the flow and creativity of talents. Zhang Qian was a famous explorer and diplomat in China's history. He went to the Western Regions twice to open the Silk Road and promoted the exchanges and cooperation between China, Central Asia and Europe. However, he also suffered setbacks and misunderstandings in his exploration and diplomatic activities in the Western Regions. His adventurous spirit and diplomatic ideas were also criticized. Sima Qian was a famous historian and writer in Chinese history. He had written the great work "Records of the Historian", which had an in-depth study and understanding of Chinese history and geography. But his personal character and morals were also questioned, and his historical views and literary achievements were also criticized. The above historical figures are important figures in the history textbooks of Grade One. Their historical status and contributions are indelible, but they also have their shortcomings and shortcomings. When evaluating historical figures, we should look at their contributions and shortcomings in a comprehensive and objective manner, not just their characteristics.