Abstract: Objectives　To explore the correlations among child abuse, personality, and defense style in middle school students. Methods　The study adopted systematic stratified sampling questionnaire survey. A total of 1115 middle school students from grade 1 to 3 in 3 middle schools in Kunming were assessed by the Screen Questionnaire of Child Abuse (SQCA). Among them, 212 students were assessed as child abuse (CA group). Another 212 students were selected as control group from non-abuse students, who were matched in sex, age, grade and class with CA group. Children from two groups were tested by the Childhood Trauma Questionnaire (CTQ), Eysenck Personality Questionnaire (EPQ) and Defense Style Questionnaire (DSQ). Results 　Compared with control group, all scores of each factor of CTQ were higher in CA group (P<0.05), the scores of psychoticism and neuroticism of EPQ were higher in CA group (P<0.05), the score of lie was lower in CA group (P<0.05), and the score of immature defense style of DSQ was higher in CA group (P<0.05). In correlated analysis, in CA group, the emotional abuse of CTQ was positively correlated with psychoticism and neuroticism of EPQ and negatively correlated with lie of EPQ, the physical abuse of CTQ was positively correlated with psychoticism and negatively correlated with lie of EPQ, the sexual abuse of CTQ was positively correlated with psychoticism and negatively correlated with lie of EPQ, and the emotional neglect was positively correlated with psychoticism and neuroticism and negatively correlated with lie of EPQ. There were no correlations between the factors of SQCA and the factors of DSQ. Conclusions　The personality of middle school students with childhood abuse were different from non-abuse students, who used more immature defense style. Personality characteristics of middle school students had some correlations with childhood abuse. There was no correlation between defense style and childhood abuse.