The purpose of the present study is to investigate the effect of self-determination on academic achievement, preferences in cooperative learning and competitive learning, through students\' intrinsic motivation. The present study verify the structural equation model of input-procedure-output framework in self-determination theory, academic achievement, preference in cooperative learning and competitive learning. Respondents of this study consists of 6,908 middle school students in Korea. The present study proposed that environmental pressure influenced on sub-variables of self-determination: autonomy, perceived competence, relatedness. These variables also influenced on students\' intrinsic motivation and academic achievement, preference in cooperative learning and competitive learning. The result showed that environmental pressure influenced n students\' autonomy and competence. Perceived competence had an direct impact on achievement. The basic psychological need for relatedness was highly associated with preference in cooperative learning, and competence was highly associated with competitive learning. With these results, we can identify the psychological conditions for students achievement and effective cooperative learning.