This paper aims at introducing the achievement in Chinese linguistic studies by Naoyoshi Ogawa, a pioneer of linguistic studies in Taiwan. He was the first student of Professor Kazutoshi Ueda of Tokyo University, founding father of Japanese linguistics. Ogawa spent all his young years in Taiwan. Ogawa edited a great number of Taiwanese dictionaries when Taiwan was under Japanese rule. Although he was merely a compiler in the Educational Bureau of the government-general, he made important contributions in the researches of languages in Taiwan including Chinese and Formosan. His achievement in linguistic studies encompasses the historical phonological study of Middle Chinese, the comparative linguistic study of dialects of Southern Min, the phonetic study of Taiwanese Southern Min, and the geolinguistic study of languages in Taiwan. I do not touch on another aspect of Ogawa's achievement in the study of Formosan languages. The reader can refer to the papers by Paul Li and Tsuchida in this issue of JTLL.