Book excerpt: The law of balance is not just a motivating power but also serves the purpose of development. How did human society develop in a balanced manner in history? How is China's Modernization impacted by the law of equilibrium? How does the law of balance affect China's economic and trade relations with other countries?This book attempts to answer these questions and more. It applies the balance law methodology to systematically analyze major factors influencing the sustainable development of the Chinese economy and society, and to discuss the balanced way of thinking, market credit, innovation energy and international collaboration that boost sustainable development. While the theoretical system of socialism with Chinese characteristics needs a balanced development perspective, solving the problem of imbalance requires a balanced approach as well as a balanced interaction between man, nature and society, which is the key factor for economic development in the 21st century.