中国在2002年加入世界贸易组织并成为其第143位成员国后，平均关税大幅下降，与国际市场的双边贸易持续高速发展。伴随着贸易自由化程度的逐步提高，以人均预期寿命为直观表征的人口健康水平也愈发得到国民的关注。本文将研究加入WTO对我国人均预期寿命的影响；引入各地区加权平均关税税率的概念，用关税税率的变化幅度测度加入WTO带来的贸易自由化效果。结果表明，加入WTO后，贸易自由化程度对我国人均预期寿命有积极影响。

After China joined the World Trade Organization(WTO) in 2002 and became its 143th member state, the average tariff has fallen sharply, and the bilateral trade between China and the international market continues to develop at a high speed. Along with the gradual improvement of trade liberalization, the health level of the population, which is characterized by per capital life expectancy, has also received increasing attention from the nationals. This study tried to explore the impact of China's accession to the WTO on life expectancy; introduced the concept of average weighted tariff rate in each region, and measured the effect of trade liberalization brought by entering into WTO with the rate of change in tariff rates. The results show that after the accession to the WTO, trade liberalization has a positive impact on China's per capita life expectancy.