On September 29, 2000 (September 2, 2000 in the lunar calendar), the heads of the world's major cities signed the Beijing Declaration. On September 29, 2000, the mayors attending the 6th World Summit of Major Cities discussed and adopted and signed the Beijing Declaration in Beijing. They promised: As we move towards the 21st century, member cities will work together to continue to contribute to the bright future of major cities, the friendship between countries and cities, and world peace! The declaration pointed out: As a place where modern civilization is embodied, cities have made outstanding contributions to the prosperity and development of the world. However, a series of fateful issues such as lack of resources, environmental degradation, population explosion, the widening development gap between cities and communities within cities, and the poverty among some urban residents, especially new immigrants, also pose huge challenges to urban development. The city leaders attending the meeting believed that the pace of economic globalization is accelerating, the internationalization of urban functions is becoming increasingly obvious, and cities are more interdependent. Cities of different countries, different cultural backgrounds, and different levels of development need to strengthen understanding, mutual respect, and common development. In the face of the rapid development of science and technology, the leaders of big cities promised to face up to the arrival of the "digital earth" era, and use it as an effective resource for cities and residents to communicate with each other and benefit from it, accelerate the innovation and development of technology and policies, and strive to establish and improve urban information networks. Unified organization and effective management of a wide range of information resources, and extensive use in planning and construction, operation monitoring, urban management and other fields, and strive to explore the sharing mechanism of information, knowledge and other resources between cities. Liu Qi, Mayor of Beijing, the host city of the conference, delivered a speech at the closing ceremony. The next big city summit will be held in Madrid in 2003.