Korean language education can be improved when an in-service training of the Korean language teachers is well accomplished. Training of Korean language teachers should be as follows. The training course should be established for various requests from Korean language teachers. The contents of the training should not differ from the title of the course. The training should reflect the latest applicable theory. An in-service training institute should hire competent lecturers. The training course should estimate the level of Korean language teacher. The training course of the qualification should be connected with the curriculum of teachers college. A job training should be operated with various ways, in various fields, and in various in-service training institutes.