The purpose of this study was to measure and evaluate the relative efficiency of specializing high schools. The ㄱresearch subjects of this study were 302 technical high schools in south korea. The input and output variables for measuring relative efficiency were selected through previous research. The input variables are the number of students per teacher, number of classes per teacher per week, scholarship per student, education cost per student, the number of books per student, and the cost of purchasing books per student. Output variables are university and college enterance rate and employment rate. As a result of the study, 125 technical high schools showed high efficiency in the CCR model. and 178 technical high schools showed high efficiency in the BCC model. There was no significant difference in efficiency of school location, open recruit system for the principal, high school equalization policy. However, differences in the type of establishment were found to vary significantly depending on the size. however difference in the type of establishment, was found wary significantly. the average difference between the national and public high schools was higher than that of private schools. As a result of analyzing the differences according to the types of specialization, the relative efficiency of other type high schools(housework, fisheries, business, physical education)was analyzed to be higher than those of commercial and industrial sectors.