Hu Qiaomu had worked quite a long time alongside Mao Zedong, of whom he had the chance to make a close observation. He analyzed the mistakes Mao Zedong made in his later years based on facts, talked about the causes of them, and made a thorough summary of experience and lessons out of them. At the same time, Hu Qiaomu also stressed that we should take a right view of Mao Zedongs mistakes in his later years, and practically and appropriately made the comment considering the overall situation. Hu Qiaomus cognition and reflection on Mao Zedongs mistakes in his later years is comprehensive and in-depth, which shows his sharp thinking patterns, and is of guiding significance for the research about Mao Zedongs later years.