Objective To analyze the correlation between middle school students' sports attitudes or behaviors and their parents' and to explore the value of information flow within the family between them. Method Middle school students were investigated for attitudes and bebaviors on sports among their parents and themselves using self-design questionnaires,including students' attitudes and behaviors rated by themselves,parents' attitudes and behaviors rated by themselves and parents' attitudes and behaviors rated by their children,and valid data were analyzed using SPSS 16.0. Results The degree of correlation between sports attitudes of middle school students and those of their parents(father:r=0.549;mother:r=0.533,P all<0.01) was higher than that between sports behaviors(father:r=0.323;mother:r=0.294,P all<0.01).The degree of correlation between parents' sports attitudes that middle school students awared of and students' sports attitudes(father:r=0.681;mother:r=0.615,P all<0.01) was higher than that between parents' sports behaviors that middle school students awared of and students' sports behaviors(father:r=0.414;mother:r=0.388,P all<0.01).The parents' sports attitudes and behaviors that their children awared of were completely mediators in the relationship between middle school students' and their parents' sports attitudes and behaviors. Conclusion The effect of information flow within the family on middle school students' sports attitudes and behaviors is significant.