In order to overcome the shortage of cluster analysis which often bias the choice of a solution and the lack of statistical indices to assist in the choice of a final solution, the current study use latent profile analysis to study types of social support of junior middle school students. Beside, we also use discriminate analysis to validate the accuracy of the classification that use latent profile analysis to class types of social support. On the other hand, we not only study the relationship between social support, learning motivation, learning strategy, academic performance from the variable level. But also analyze the effect of different types of social support on learning motivation, learning strategy, academic performance from the perspective of individual differences. 374 junior middle school students are selected form one middle school to attend the questionnaire survey which includes perceived social support scale, motivated strategies for learning questionnaire and learning Motivation Scale. Students’ performances are measured by their mid-term test scores.