The purpose of this study is to analyze the development of Korean textbooks for multicultural families overseen by the National Institute of Korean Language and recommend policies based on the findings. First, this study explains the development of textbooks that was carried out from 2017 to 2019. The annual process includes field application, gender impact assessment, and teacher education. In addition, it also includes textbook dissemination, online textbook services, and the development of placement and achievement tests after the publishing of textbooks. Next, this study details the evaluation and analysis of the survey responses provided by teachers that participated in the teacher education program organized by the National Institute of Korean Language in 2019. It concludes with the proposal of several policies to further improve the overall process. Policies are related with the development of placement and achievement tests as a supplementary material, the review of social experts, the development of online courses, the reflection of responses to textbooks, and wider dissemination of textbooks.