Aim: To analyze the personality characteristics of children with emotional disorder by means of questionnaire, and compare with normal children of the same age. Methods: Thirty children with emotional disorder (patient group), who received trace biological computer introduction stimulation in Beijing Children's Hospital affiliated to Capital University of Medical Sciences between September 2003 and September 2004, took part in the study, and 30 healthy children (control group) with an average age of 12 years old were selected from Grade 1 of a middle school in Beijing city. All the subjects were assessed with Eysenck personality questionnaire (EPQ) individually and in group. There were 4 dimensions of psychoticism, introversion-extraversion, neuroticism, stability and lie in EPQ, each dimension was expressed by standard score (T), 38.5 and 61.5 points were the deliminations. The questionnaires were finished by the children themselves, those who were younger or had worse reading ability chose the answer themselves after the psychological evaluator read the questions for them. The results were input to the software for evaluation and reservation, and compared with those in the control group and norms. Results: In the patient group, 30 questionnaires were sent out and all were collected back, the effective rate was 100%. In the control group, 35 questionnaires were sent out, 30 were collected back, the effective rate was 86%. 1 Compared with the control group, the score of introversion-extraversion was lower and the score of neuroticism was higher in the patient group, there were extremely significant differences (P < 0.001). 2 The scores of the dimensions in EPQ between males and females had no differences in the patient group and control group, there was also no difference between the control group and national norms. 3 The children with emotional disorder had more personality characteristics of introversion (80%), emotional instability (90%) and melancholic temperament (73%), which were extremely and significantly higher than those in the control group (χ2=17.333, 31.729, 31.729, P < 0.001). Conclusion: Children with emotional disorder have the personality characteristics of extreme introversion, emotional unstability and melancholic temperament, which can block the healthy development of the children and induce many psychological and mental diseases. The personality of growing children is developing and of plasticity. Suitable education and guidance, early knowledge of the inside activity of the children can make their negative emotions lead off timely and effectively. Better environment and education can reduce and eliminate the bad personality characteristics caused by genetics, and accelerate the formation and development of normal traits of the children.