Since the construction of Guangdong, Hong Kong and Macao Great Bay area, we must clearly understand the new situation and new requirements of building a new development pattern of "double circulation", building a unified large market, promoting high-quality development, maintaining long-term prosperity and stability of Hong Kong and Macao, and serving the construction of the "the Belt and Road" after the effective circulation of capital, technology, talents, information and other production factors in the Great Bay area promoted by a series of "soft and hard links", It has put forward a series of new propositions for the construction of the Guangdong Hong Kong Macao Great Bay area. To continue to work with Hong Kong and Macao to promote the construction of the Greater Bay area, we need to promote the integrated development under the principle of "one country, two systems" in the new development stage, and achieve the deep integration of the Greater Bay area with innovative ideas. Integrated development is an effective model for the practice of "one country, two systems". The Party Central Committee attaches great importance to the long-term prosperity and stability of Hong Kong and Macao. One of the construction intentions of Guangdong, Hong Kong and Macao Bay area is to provide new space for Hong Kong and Macao to integrate into the overall situation of national development. The construction practice of the Great Bay area shows that with the strong support of the state, the integration of Guangdong, Hong Kong and Macao has been deepened, the opportunities for Hong Kong and Macao to integrate into the overall situation of national development have been constantly emerging, the fields of integration have been constantly enriched, and the enthusiasm for integration has been constantly rising. At the same time, Guangdong, as a "new space" for Hong Kong and Macao to give play to their unique advantages, has also gained "new impetus" for the construction of a new pattern of comprehensive opening up. The integrated development has continuously enhanced the vitality of Dawan district. First of all, the integrated development will help the cities in Guangdong, Hong Kong and Macao Greater Bay area to carry out high-quality cooperation. Promote the efficient and convenient circulation of capital, technology, information, goods, talents and other production factors in the region through "soft and hard connectivity", and enhance the degree of market integration, trade and investment liberalization and facilitation. This is not only conducive to maintaining the prosperity and stability of Hong Kong and Macao, but also conducive to promoting the economic development of Guangdong. For example, within about one quarter after the "cross-border wealth management link" was launched, the scale of "southbound link" invested in Hong Kong exceeded 100 million yuan, and the scale of "northbound link" invested in the mainland of Dawan District exceeded 170 million yuan. This shows that with the continuous innovation of measures to support the financial interconnection among Guangdong, Hong Kong and Macao, the measures to help the two-way opening of the financial market in the Greater Bay area, such as the "Shenzhen Hong Kong Link", "bond" southbound link "and" cross-border financial link ", have not only injected momentum into the prosperity and development of the financial market in Hong Kong, but also promoted the vigorous development of the capital market in the Greater Bay area. Second, integrated development helps to solve the "bottleneck" problem in building a new development pattern. In order to build an international scientific and technological innovation center in the Greater Bay area of Guangdong, Hong Kong and Macao, it is imperative to give full play to the advantages of Guangdong, Hong Kong and Macao in scientific and technological R & D and industrial innovation and stimulate the vitality of various innovation subjects. In order to serve the coordinated development of science and technology innovation industries and support scholars from the three places to carry out scientific research cooperation, the policy of Guangdong Province on the use of financial scientific research funds in Hong Kong and Macao has been implemented since 2019. The number of scientific and technological cooperation carriers, cooperation projects and scientific research personnel in Guangdong, Hong Kong and Guangdong and Macao have been increasing. At the same time, in order to cultivate potential scientific research personnel in Hong Kong and Macao, and support outstanding scholars in Hong Kong and Macao to make innovations in the field of basic research, the National Natural Science Foundation of China has also started from 2019