Over the past 40 years of reform and opening up, Shenzhen has created an amazing economic miracle in the world, from "three sources and one supplement" to "the factory of the world" and "the capital of innovation", from the former frontier towns to the international metropolis with global influence. Especially since the 18th National Congress of the Communist Party of China, Shenzhen has practiced the concept of "green waters and green mountains are golden mountains and silver mountains". The concept, objectives and measures of ecological environmental protection have been undergoing profound changes, and the comprehensive, coordinated and sustainable development of economic society and ecological environment has been achieved. The development process and practice of Shenzhen have shown that only by adhering to ecological priority and green development, and by adhering to development and reform to solve environmental problems arising in the process of economic development, can we win the initiative in the global scientific and technological revolution and industrial transformation, and realize the coordinated promotion of high-quality economic development and high-level protection of the ecological environment (hereinafter referred to as "double high"). 1、 Basic conditions for Shenzhen to jointly promote "double high" At present, Shenzhen has entered the stage of "high-quality economic development and high-level environmental protection", and has the macro premise to achieve "double high"; Industrial optimization and upgrading and basin coordinated governance are the inevitable requirements for building a high-quality modern economic system, and also the key to solving production and domestic pollution, forming the medium basis of "double high"; The enterprise is full of vitality and the residents' awareness of environmental protection is enhanced, forming the micro vitality of realizing "double high". （1） With rapid economic development and high level of environmental protection, the macro premise is that economic growth is the macro premise for promoting the "double high". In 2021, Shenzhen's gross domestic product (GDP) will reach 3.07 trillion yuan, making it the third city in China after Shanghai and Beijing to break the 3 trillion yuan mark; The per capita GDP is 174600 yuan, about twice the national average. While maintaining the rapid economic development, Shenzhen has issued a series of policies and regulations to continuously improve the environmental management system in the whole process of economic development. During the "13th Five-Year Plan" period, the average annual concentration of PM2.5 in Shenzhen dropped to 19 micrograms per cubic meter, and the proportion of days with good air quality reached 97%, which is at the leading level among domestic megacities. Water pollution control has achieved a historic transformation, taking the lead in realizing the elimination of black and odorous water in the whole city. In 2019, it was rated by the State Council as one of the five cities with significant improvement in water environment quality in key river basins, and was selected as the national demonstration city for black and odorous water treatment. Shenzhen has successfully crossed the inflection point of the environmental Kuznets curve (EKC), which is largely due to the transformation of the economic development mode. The environmental problems arising in the process of economic development also need to be solved with development ideas and methods. Shenzhen's economic prosperity has created conditions for ecological environment protection, and excellent ecological environment endowment has become the key factor to attract enterprises to gather. （2） Industrial control over the source, governance and multi-win, solid medium foundation, industrial optimization and upgrading are the medium foundation for promoting "double high". Guided by green development, Shenzhen pays attention to industrial selection, structural adjustment, optimization and upgrading, reduces the generation and emission of pollutants from the source, constantly strengthens the coordinated control of pollution control, avoids the treatment of one kind of pollution and produces new pollution, and achieves a high level of environmental protection. From 2016 to 2020, Shenzhen has formed a leading role in the electronic information industry, led by biomedicine, new energy and new materials