In these years, there is a large change of population structure in Taiwan. The problem of declining birthrate significantly affects the development of lifelong education policy. Therefore, it is very important and urgent to find out the influences of few-generating. The purpose of this study is to understand how the changing of population structure impacts on the lifelong education policy in Taiwan, and try to draw up appropriate policies to resolve the problem. First, the paper aims to discuss the realistic implementation of lifelong education policy promoted by Ministry of Education of ROC. In addition, the research also examines and analyzes the development in order to understand the results of furthering the policies and the process of the development. Finally, a conclusion will be provided on the results and difficulties of promoting lifelong education. Besides, the paper discuss other countries' policy. This research also contributes the reflection of practicing policies in facing the problem of few-generating. Finally, some suggestions and strategies are mentioned in this paper.