China's population urbanization rate, which reached 51 percent last year, will further climb to 60 percent by 2020, bringing the country's urban population to around 850 million, according to a demographic study released on May 3.

The China Population and Development Research Center said in a report that in the next 20 years, China's urbanization will maintain a fast speed, with around 300 million people moving from rural to urban areas.

China's urbanization will enter a stable stage by the middle of the 21st century, with the peak between 70-75 percent, it said.

In 2011, the number of migrant workers in China reached 230 million, the report said, adding that annual growth of the migrant population will be around 10 million in the 2011-15 period.