Today, 81 years ago, on November 21, 1944 (October 6, 1944 in the lunar calendar), Guo Moruo's "Jiashen Three Hundred Anniversary Sacrifice" was designated as a rectification document. On November 21, 1944, Mao Zedong wrote to Guo Moruo, telling him that the Communist Party of China (CPC) had designated the 300th Anniversary of Jiashen as a rectification document, and said, "A small victory is pride, a big victory is even more pride, and it suffers losses again and again. How to avoid this kind of problem is really worth noting." I hope it will be very beneficial for Guo Moruo to write an article about the experience of Taiping Heavenly Kingdom. The letter also pointed out: War of Resistance against Japan should be a mature democratic revolution, the international conditions are very good, and the domestic efforts depend on our efforts. "Although I am conscientious and afraid that something will go wrong, maybe something will come from somewhere; What mistakes and shortcomings have you seen, and I hope to know them at any time."