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This book covers the low fertility in China that has drawn wide attention and exerts a far-reaching influence on the population development. In this book, with population census and sample survey data, and mathematical demographic methods and statistical methods, the authors systematically examined China’s fertility levels over the past decades, fertility patterns, changes in birth numbers, projected the future population and simulated the 4-2-1 family structure and families bereaved of their only child. The authors developed a series of models and methods, got some important results, and drew some important conclusions, which provides reference for understanding the changing trend in China’s fertility levels and patters, and for further relaxing China’s fertility policy.