The world is undergoing a period of great development, great change, and great adjustment. Peace and development remain the themes of the times. World multipolarization, economic globalization, social informatization, and cultural diversification are developing in depth. The global governance system and the international order are accelerating. Increasing ties and interdependence, more balanced international power balance, and irreversible trend of peaceful development. At the same time, the world faces instability and uncertainty, insufficient economic growth momentum in the world, and the growing differentiation between the rich and the poor. Doctrine, cybersecurity, major infectious diseases, climate change and other non-traditional security threats continue to spread, and humanity faces many common challenges. What this text says next:. ['Why do we think the current world is in an era of development and radical change?', 'China is an important force for maintaining world peace and promoting common development of the world.', 'Correctly understanding and grasping the theme of the times is the basis for countries to formulate policies.', 'People should work together to address the risks and challenges we face.']