The purpose of this study was to analyze advanced research about Assessment Tools of Korean Language Proficiency for multicultural background students and suggest directions. There is a great need to develop a Assessment Tools of Korean Language Proficiency for multicultural background students considering their cognitive levels, learning purposes, residence periods in Korea, cultural background of students etc. For this flexible running, It would be useful to develop a standard form like "record sheet of observation or portfolios of the students` levels. We suggested that it is necessary to subdivide multicultural background students strictly and approach Korean Language Proficiency level and question level easily. Also, It is important to build up the legal system and provide an institutional strategy for Assessment Tools of Korean Language Proficiency for multicultural background students. For this institutional management, There is also a need to operate department of municipal ministry of education or special institution like a tentatively named "Korean Language Assessment Center for Multicultural background Students."