This study examined whether English textbooks, used in 13 vocational high schools in the J city located in Gyeongnam, followed the national English curriculum. Among these vocational high schools, 10 schools used 2 textbooks of humanities while 3 schools adopted 3 vocational textbooks (one textbook per major-business, engineering, & tourism). The findings illustrated that two textbooks of humanities abided by the national curriculum by covering learning activities systematically in a gradual manner, as well as four skills in balance. However, in terms of topics, they did not. On the other hand, three vocational textbooks covered field-specific topics. Regretfully, however, they had disparities in exercise contents and types across three textbooks, which indicated these textbooks did not abide by the national curriculum in a consistent manner. This study therefore suggests English textbooks in vocational high schools be revised based on the learners needs and demands.