As a result, there were almost no natural enemies of pests in farmland, and the grain harvest in the second year was seriously poor, which caused a very serious famine problem. Soon after, many ornithologists, including Zheng, confirmed through on-the-spot research that in the sparrow's diet, artificially planted grains only accounted for less than 50%, and their research results were even published in People's Daily, the central organ newspaper of China, which was unique. Their strong opposition was finally supported by the Chinese Academy of Sciences. 1October 27th, 1959 165438, Party Secretary of Chinese Academy of Sciences, Zhang Jinfu synthesized the opinions of the biological community and wrote a Report on Sparrows to the Chairman, which was forwarded by Hu Qiaomu to Mao Zedong. This report with a lot of scientific basis and analysis finally moved Mao Zedong. Mao Zedong clearly pointed out in the Central Committee's instructions on health work drafted by him on March 1960: "Don't beat sparrows, use bugs instead, and the slogan is' kill rats, bugs, flies and mosquitoes'." At this point, the scientists' indomitable demand for the sparrow's "rehabilitation" has been achieved, or to put it more bluntly, Mao Zedong has admitted his mistake in eliminating the sparrow and personally rehabilitated the sparrow. However, on April 6 of the same year, in a report on agricultural issues made by a leader at the Second Session of the Second National People's Congress, the "expression" of this issue was very euphemistic: "Sparrows have been almost wiped out, and the grain output has increased year by year, and the harm of sparrows to grain production has been greatly reduced; At the same time, the area of forests and fruit trees has been greatly developed, and sparrows are the natural enemies of forests and fruit trees. So, don't play sparrows in the future. " On April 19, 2009, the 40 agricultural development programs including the revision of "four pests" were formally submitted to the second session of the Second National People's Congress of People's Republic of China (PRC) for discussion and adoption, and announced to the whole country. From "bombing sparrows because they can't afford to eat food losses caused by sparrows" to "weighing the pros and cons comprehensively, preferring to eat food losses and tolerating sparrows", the role of sparrows has finally been affirmed and the practice of "bombing sparrows" has been changed.