Objective The research on the relationship between family socio-economic status and academic achievements of middle-school students is to understand the overall conditions of family socio-economic status and students’academic performance so as to provide basis for school workers and parents to better educate their children.Method 750middle-school students were selected as the research subjects with the method of stratified cluster sampling and were asked to do the questionnaire about their family socio-economic status.Their grades for mid-term and final examinations were recorded.Results Though father’s occupation and student’s math scores were not highly correlated

the parents’educational background and occupational level were correlated with students’academic performance and the difference was statistically significant（P<0.05）.Conclusion There are significant differences between different family socio-economic status and middle-school students’academic performance.