中文摘要：

本文基于1981--2010年台湾人口死亡率数据，对人口死亡率估计模型进行深层次分析。研究发现：（1）1—100岁之间各年龄组别中心死亡率与时间因素存在显著负相关；45岁以后，时间对各年龄组别中心死亡率的影响程度形成“矿’字型。（2）不同年龄组和不同时间段之间过渡时所呈现的“亦此亦彼”性，即模糊性，对死亡率的影响在现有的死亡率估计模型中常被忽视。（3）死亡率的不确定性主要源自模糊不确定性，本文构建的死亡率模糊模型可以提高死亡率估计精度。

英文摘要：

The paper makes a detailed study on the mortality models based on Taiwan population mortality from 1981 to 2010. The findings show that there has been a significantly negative correlation between time factor and central mortality in dif- ferent age groups from 1 to 100 years old. Time influence degree on central mortality in different age groups over 45 years old exercises like a V shape. On the other hand, there appears ＂fuzziness＂ that happens at a transitional period of time between different age groups and different time phases, whose influence on death rate tends to be ignored in the existing mortality mod- els. Finally, the uncertainty of mortality comes mainly from fuzziness, and fuzzy mortality model produced in this paper can im- prove the estimation accuracy of mortality.