Methods The data of the fourth census in 1990 and sampling investigation of population in 1995 were used to obtain the elderly coefficient and longevity proportion,and abridged life table was applied to work out expectation life.

• 方法 采用全国第四次人口普查、1995年人口抽查和 1999年云南省长寿地区老年人口多点典型调查资料计算老年人口系数、长寿老人比例 ,并应用简易寿命表法计算平均期望寿命。