Objective To investigate the relationship between social support and state-trait anxiety in senior middle school students.MethodsA total of 165 senior middle school students received Social Support Questionnaire and State-Trait Anxiety Inventory,and social support and anxiety were compared by gender,home address and one-child family.Chi-square test and t test were used for data analysis.Results Utilization of social support showed significant difference between male and female studen(t=-1.994,P＜0.05).Significant difference of objective support existed between grade one,grade two and grade three (F=0.935,P＜0.05).Significant differences of social support(t=-2.039,P＜0.05)and subjective support(t=-2.769,P＜0.05)were found between urban and rural areas.In difierent grades,the state and trait anxiety Was significantly different(F=3.063,P＜0.05＝.There was negative correlation between social support and state-trait anxiety(r=-0.376,P＜0.05＝.ConclusionGood social support may help to reduce state anxiety among senior middle school students.