Modernization which originated fro m Europe has made the population tren ds change from more birth -more death to less birth -less death.Modernization not only caused the ageing of the population in Europe,but also had its influence in USA,Japan and some o ther countries.China and Korea have also become into ageing countries.A s the global ageing situation intensifies various problems caused by ageing will become more and more obvious o ver time.This paper will focus on the com parative study on the present situation of ageing in China,Japan and Kore a,find out the problems caused by agein g and make examination and research o n these problems,defining future projects in this field.