This research investigated junior high schools teachers' perception of Twelve-year basic education enrollment mode in Tainan city. In the study, 456 junior high school teachers were randomly selected as stratified samples. Each was given a uniform questionnaire, and 410 valid questionnaires were retrieved. The following conclusions were drawn from this study: junior high school teachers in Tainan City had mean to the lower level at "concept of perception" and "path of perception" of twelve-year compulsory education enrollment mode; there were significant differences in some background variables on "concept of perception" and "path of perception". According to the findings and conclusions given above, the study proposed recommendations for educational authorities, junior high school teachers, and future researches.