In this study, a variety of questionnaires were used to examine domain specificity of academic emotions in 516 sixth-graders and eighth-graders .The results showed: ①Significant subject differences of academic emotions in children were found . ② Significant gender differences and grade differences of academic emotions were found in various subjects. Boys and girls showed more positive emotions in their own advantage subjects. Sixth-graders were super in academic emotions than eighth-graders . ③In various subjects, the impact of family support on academic emotions showed relatively strong consistency. Significant positive relations were found between family support and positive academic emotions.There was a more complex mechanism of the impact of family support on negative academic emotions.