Present study aims to develop the Scale of Future Imagination Disposition as an assessment for the disposition of future thinking and imagination. Seven scopes of future imagination dispositions were concluded from the analyses of previous studies. A pretest edition of 48 items was developed on the bases of these seven scopes. Sample for pretest were 358 senior high school students in Taipei city. By the methods of items analysis and exploratory factor analysis, 20 items were confirmed and selected into formal scale. The scale has four dimensions, they are: (1) beyond reality, (2) emotional value, (3) plot construction, and (4) past review and future prediction. Each dimension includes 5 items. For the reliability and validity test, sample were 1520 students from 38 classrooms in 19 senior high schools in northern, central, southern and eastern Taiwan. 1391 questionnaire were returned, and valid sample were 1388 people. They were 687 males and 651 females, including 393 vocational high school students and 945 high school students. Return rate of valid sample was 88.03%. Result finds that the scales shows adequate internal consistencies. Cronbach's α of subscales are between .83~.86, while it is .92 for the whole scale. By the confirmatory factor analysis for construct validity test, the scale shows adequate model structure. The criterion-related validity of the scale is evaluated with reference to the scores of Creativity assessment Packet, Imagination Disposition Test, and Watson-Glaser Critical Thinking Appraisal. It finds that the scale is highly correlated to imagination traits, while it is moderately associated to creative disposition. In particular, the correlation with imagination disposition is high, the association with critical thinking is less. In a sum, the scale is correlated to but distinguished from creative thinking, creative disposition and imagination traits. In additions, vocational high school students who participated the program ”Creativity and Imagining the Future in Education” showed stronger disposition of emotional value for future imagination than the students who did not. The students of design department in vocational high school tended to show up the dispositions of vision forming for future imagination and emotion and value than the students of ordinary department. The scale appears to be valid in construct.