Migration-urbanization has become an important part of China's urbanization process, but no much attention is paid to . This article starts with the development of migration-urbanization, analysis the features and origin. Then it researches the positive and negative effect that migration-urbanization has on China's economic development and urbanization. After that, the article also tries to explain problems and barriers lies in the process of China's migration-urbanization. At last, the article points out that migration- urbanization is necessary in China and raises some suggestions and measures to promote the coordinate development of China's migration-urbanization.