Objective To explore the relationship between dental trauma for children and their psychological behavior characteristics. Methods By using the method of case-control study, 7-11 years of age children accepting oral health examination in our department were asked to fill in the questionnaire. The children without dental trauma were selected as the control group and the children with permanent tooth injury were selected as the injury group. Each group has 57 cases. All children finished the Eysenck personality questionnaire (EPQ) and their parents finished the Achenbach child behavior capacity list (CBCL). Results (1)The average CBCL score (32.51±20.41) and scores of P and N branch capacity lists in EPQ (44.72±11.67, 48.05±12.39) of the injury group were all higher than those of the control group (17.19±11.67, 37.64±8.17, 41.40±8.78)(P<0.01). (2) The detecting rate of behavior problems in injury group was also higher than that of the control group (33.33%, 7.02%, P<0.01), OR=6.63, 95%CI=2.09-21.05. Boys of the injury group had higher scores than those in the control group in seven factors (depression, social withdrawn, restlessness, violation of discipline, attack, compel and social problems) (P<0.05), and girls of the injury group also had higher scores than those in the control group did in three factors (depression, social withdrawn and attack) (P<0.05). (3) In the injury group, boys had higher scores in the factor of schizoid anxiety than girls did (P<0.01), risk factors were depression (OR=0.529, 95%CI=0.292-0.959), social withdrawn (OR=2.274, 95%CI=1.311-3.944), restlessness (OR=0.426, 95%CI=0.213-0.852), violation of discipline (OR=0.426, 95%CI=0.213-0.852) and attack (OR=0.644, 95%CI=0.459-0.903). However, girls had higher scores in the factor of depression than boys(P<0.05), their risk factor was depression (OR=0.573, 95%CI=0.357-0.919). Conclusion There is a certain correlation between tooth injury and their psychological behavior characteristics of children. Key words: Dental trauma; Youth permanent tooth; Children; Personality; Behavior