The purpose of the study is to approach Dr. Thomas Barclay, an English Presbyterian missionary, his life career in Taiwan. Dr. Thomas Barclay, a Scot, who came to Taiwan in May, 1875 as a missionary for sixty years. He was involved in numerous activities during his stay in Taiwan. They are classified into three categories in this thesis, namely, ministries in preaching, education, and cultural. His activities have left profound influence and significant impact on Taiwan.