The one child norm introduced in China in the late 1970s has been the major reason for low population growth. This measure led to a decline in the sex ratio defined as the proportion of females per 1000 males. One child norm and the resultant decline in the growth of population has also led to an ageing population in China. After a few decades, there will be more elderly people in proportion to young people in China. This will force China to take steps to provide social security measures with fewer workers to contribute actively in the economic activities.