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松溪县地处闽北边题僻壤，人口15．6万，历史上未曾有过人口平均寿命调查统计的记载。近30年分别开展过两次居民死因调查和两次人口普查并进行人口平均寿命统计。本文就这四次的人口平均寿命的统计结果作一变动观察和初步探讨。1资料的来源松溪县1975年人口死因回顾性调查资料
Songxi County is located in the north of the border and has a population of 156,000. There has been no record of the average life span survey of the population in history. In the past 30 years, two residents’ death cause investigations and two population census have been conducted and the average life expectancy statistics have been carried out. This article makes a change observation and preliminary discussion on the statistical results of the four population average life spans. 1 Sources of data Retrospective survey data on death causes in 1975 in Songxi County