This study aims to identify the characteristics of supervisors in the social work arena by types. In order to accomplish the purpose of this study, it used the Q method. It explored the preference of 34 undergraduate students who finished social work practicum. As a result, it was generally classified into four desirable supervisors types; ‘professional and educational type’, ‘moral and practice type’, ‘open-mind and respect type’ and ‘independence and supporting type’. Regarding the characteristics of each type, type I means that supervisors have maintained the professional knowledge and skills and, at the same time, they should be able to discover the full potential of students. Type II intends that should provide role model to be moral and ethical. Type III means that supervisors and students can easily meet each other on the basis of mutual respect. Type IV intends that supervisor ensures students' autonomy to find their own way. On the other hands, students, in general, expressed antipathy for oppressive supervisors. In conclusion, this study suggests a basic guideline for supervisors in social work practicum in order to achieve the original purpose of field education and satisfy social work students’ needs.