The purpose of this study is to study the bibliographic characteristics of fifth Korean textbooks published in the United States in the 1940s. This book is Bong. Y. Choy(1943), Harold H. W. Sunoo(1944), Edward. W. Pai(1944), Fred Lukoff(1945), and Fred Lukoff(1947). In this study, I found two more books that have not been introduced yet. Korean Reader "(1943), and" Conversational Korean "(1944) have directly discovered and introduced the textbooks. The authors introduced in detail the authors who were not introduced or revealed well. In addition, we compared the bibliographies, types and composition methods of the six Korean textbooks. Through detailed study, the characteristics of the notation system of each textbook were revealed, and the differences in the characteristics of the learning target, the textbook type, the textbook grade, the characteristics of the textbook structure. This study is worthy of the study because it shows the course of the Korean language education through the Korean language textbook published in USA in the 1940s. However, based on the textbook theory of modern viewpoint, there are limitations that can not be analyzed from various angles in terms of ‘textural typology, textbook development theory, and textbook evaluation theory’. (Kyungdong University)