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Building the Guangdong–Hong Kong–Macao Greater Bay Area is conducive to promoting the high economic integration of Guangdong, Hong Kong and Macao, building a new open economic system, and carrying out dual exploration of politics and economy, which is of great strategic significance. Public governance is not only a substitute for the traditional public administration paradigm, but also a product of interdisciplinary research and multidisciplinary development of social science. Its greatest feature is that it is a transcendence of traditional government domination theory. Close integration of economic decentralization and vertical political management system is the core connotation of Chinese-style decentralization. In terms of fiscal system, China is among the countries with the highest degree of decentralization in the world. Starting from the concept of public goods and based on data mining algorithm, this paper expounds the basic theory of public goods supply mode and the factors affecting the supply of public goods. On the basis of clear theory, this paper probes into the characteristics and existing problems of the traditional supply mode of public goods in China, which has positive significance for improving the quantity and quality of the supply of public goods in Guangdong–Hong Kong–Macao Greater Bay Area.