"Practice has proved that with the strong leadership of the Communist Party of China, the strong support of the great motherland, and the concerted efforts of the people of all ethnic groups in China, including compatriots in the Hong Kong Special Administrative Region, the Macao Special Administrative Region, and Taiwan, long-term prosperity and stability of Hong Kong and Macao will be maintained, and complete reunification of the motherland will be achieved." Form the overall strategy of the Communist Party of China to solve the Taiwan issue in the new era, firmly grasp the leading and initiative of cross-strait relations, vigorously maintain peace and stability in the Taiwan Straits, and solidly promote the process of reunification of the motherland. Under the guidance of the innovation theory, Hong Kong and Macao have maintained a good situation of prosperity and stability. The central government has adhered to the principle of "one country, two systems". First, it is unswerving to ensure that it will not change or waver; Second, it is comprehensive and accurate to ensure no distortion; The fundamental purpose of "one country, two systems" is to safeguard national sovereignty, security and development interests, and maintain the long-term prosperity and stability of Hong Kong and Macao; Safeguarding national sovereignty, security and development interests is the highest principle of the "one country, two systems" policy; The stronger the "one country" principle, the more obvious the advantages of "two systems"; Hong Kong and Macao must be governed by law; We must adhere to the unity of the overall governance of the central government and the guarantee of the high degree of autonomy of the special administrative regions; We must implement the policy of "patriots governing Hong Kong" and "patriots governing Macao"; We must maintain the unique position and advantages of Hong Kong and Macao; There is no reason to change such a good system as "one country, two systems", which must be adhered to for a long time; These important expositions enrich and develop the theory of "one country, two systems", and provide fundamental guidance for promoting the practice of "one country, two systems" in the new era. The report of the 19th National Congress of the Communist Party of China clearly pointed out that the development of Hong Kong and Macao is closely linked to the development of the mainland, and we should support the integration of Hong Kong and Macao into the overall national development. Over the past decade, Hong Kong and Macao have taken a wider and wider path of complementary advantages and common development with the mainland. A series of major national strategies and policies and measures have been introduced one after another. The special chapter on Hong Kong and Macao in the outline of the 13th five year plan to the 14th five year plan has clearly positioned and scientifically planned Hong Kong and Macao. The outline of the development plan for the Guangdong Hong Kong Macao great Bay area has positioned Hong Kong and Macao as a central city, supported Hong Kong and Macao to participate in and contribute to the construction of the "the Belt and Road", and provided a rare opportunity, inexhaustible momentum and broad space for the development of Hong Kong and Macao. The development and construction of Hong Kong and Macao are progressing steadily. With the full support of the motherland, Hong Kong's economy is booming, its position as an international financial, shipping and trade center is stable, its innovative science and technology industry is rapidly emerging, its freedom and openness rank first in the world, and its business environment is world-class. The original laws, including the common law, have been maintained and developed. Macao's economy has developed rapidly, with per capita GDP entering