China's population policy has been the focus of international attention. The existence of a strict birth planning policy in the world's most populous country is enough to arouse great interest. Why did the Chinese government formulate such a stringent policy? Why has this policy lasted so long? What is the source of its success—at least in rapidly reducing fertility levels and controlling population growth? In addition to its impact on demographic processes, what has it brought to China's economy, society, and politics? Both Chinese and foreign scholars are trying to answer these questions.