There is a declining of mortality rate of accident in Taiwan, especially since 1990. However, life expectancy seems more acceptable than mortality rate for people. Life table is the connection between the 2 terms. The current life table gives a cross-sectional view of mortality and survival experience of a population during a current year. It is entirely dependent on the age-specific death rates prevailing in the year for which it is constructed. Such tables project the life span of each individual in a hypothetical cohort on the basis of the actual death rate in a given population. In this study, we compute the gains of life expectancies at age 0-4, 5-14 and 15-59 due to the changing of mortality rate of accident in recent 20 years by employing current life table method. In addition, a prediction model for the gains of life expectances with time is established. Based on this prediction function we figure out the expected year to attain 25%, 50%, 75%, and 100% of the gains of life expectancies assume the accident is completely eliminated in reference year 1985. Also, a life table algorithm for computing the gains of life expectances is constructed.