Abstract: The research was to workout the middle school student's (from grade6 to grade 12) Social adaptation Scale.There were 3595 efficiency samples (male: 1728persons;female,1867persons,come from grade 7 to grade 12) in the study.From the scale's being made,first surveyed,emended and remeasured,there were four dimensions were confirmed: they were content particularity,forecast command,psychological adjustment and dynamical sustain.The scale had high reliability and validity,the α reliability is 0.97,as well as the consistent validity and standard validity is 0.65 and 0.68.As a whole,there was significant sex difference at the student's social adaptation,and in the category the scores for girls were higher than that for boys.The student's social adaptation were changed but not increased with the grades advanced at the same time.The student's social adaptation was a developmental process and a part of student's personalities,and it was also related to student's study pressure and the life's events what they had encountered.

Key words: social adaptation, dimensionality, scale structure