Abstract: This paper has botten the following conclusions: 1）Describing the current situation of China“ spopulation ageing, by using the forth and fifth national population census of China in 1990 and 2000.2) Based upon it and by using the China‘ s Population Prospect System, having done some forecasts aboutthe population of China in next 50 years. 3)To summary the characteristics of China‘ s population ageingcomparison with other countries in the world which have gotten into the population ageing society.4)Giving some suggestions guideline for the policy maker.