In Japanese ruled period, the systematical study of pharmaceutical plant and natural resources in Taiwan is promoted by the Government-General of Taiwan to enhance the productivity of the colony. The academic results of the period, featured by the comprehensive study on pharmaceutical plant used by Chinese and indigenous groups and the scientific method of studying natural history, did deeply impact the study of pharmaceutical plant after recession. Lots of studies or reports published in the Japanese ruled period, and the study utilized the collections in National Taiwan Library and filter the data with key words of “treatment” “medicine”, “traditional Asian medicine”, “traditional Asian treatment”,“plant”, and “disease”, picking up and reviewing literature related to pharmaceutical Filicales. The study aims to the analysis of pharmaceutical Filicales is that Filicales is a critical medical resource for the ancient residence in Taiwan and the environment in Taiwan, which is warm and humid, is also suitable for the growth of the plant.