This study is an examination of the Korean language learning of the early Protestant missionaries, which was not revealed in the previous discussion, based on the records of the `Presbyterian Church U.S.A. (PCUSA)` Korea Mission. Missionaries from the `PCUSA` sent to Korea held an annual banquet where mission activities were reported, and in those reports were left records related to Korean language learning by missionaries. As a result, it was confirmed that Korean language learning was conducted mainly by the Language Committee in the Mission. The Language Committee regularly assessed the Korean language skills of missionaries and reported them to the Mission Board. In addition, senior and junior missionaries were divided into two groups based on their Korean ability. The Language Committee has been responsible for managing the Korean language learning of the missionaries by appointing the supervisors in each mission area. The Language Committee developed and used the `Korean Language Learning Course,` which is an evaluation tool for the evaluation of Korean language ability and a guideline for Korean language learning. This was the best educational choice that focused on `learning` in the situation when collective teaching and learning was difficult due to locale and time constraints. Therefore, it was confirmed that the Korean language learning of the Protestant missionaries in the late 19th and early 20th centuries was done within the active control of the Mission rather than the individual missionary.