Propose to research the Taiwan modern literature at the time when Japan governed, Japanese language will not be an ingorable subject to investigate. Lai Ho who has being called as the father of Taiwan modern literature. At moment, many researchers believe that, even though Lai Ho has enough ability of Japanese writing, but, he had intentionally written his compositions in vernacular style, that's how he exhibited his judgment and resistance to against colonalist. Nevertheless on the other hand, “Does Lai Ho truly have good enough ability in Japanese?”, in fact, there is few research report which has discussed about. The purpose of discourse is reviewing the Japanese language ability of Lai Ho from Japanese education history and instruction side, furthermore, give an answer to the question what is that, “he didn't want to use Japanese” or “he was unable to write it”.