Since the reform and opening up, China’s manufacturing industry has experienced considerable development. This paper divides the development of China’s manufacturing industry from 1978 to 2020 into three periods: recovery period, adjustment period and intelligent development period. This paper collects 855 manufacturing policies issued by the Chinese government in these three periods, uses LDA topic model and synergy network to study the policy evolution trend in these periods, and studies policy synergy combined with the classification of policy instruments. The results show that the first period of China’s manufacturing industry mainly focuses on reform and opening up, and pays more attention to technology renewal, product manufacturing and process improvement. The second period pays more attention to product quality, technology, enterprise development, industry informatization and standardization. The third period focuses on the development of intelligence, informatization, technology and production process, enterprise management and so on. The results of policy synergy analysis show that the use of China's environmental policy is redundant. There are some deficiencies in demand policy. At the same time, policies should pay more attention to basic industries.
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