It is aim to study the characteristics of parent-adolescent conflict and to determine some factors that related to the conflict among students who had school behavior problems and students who did not have. The sample of this study were 638 students from grade 9 of two coeducated governmental school in Bangkok. The subjects were divided into 2 groups

the controlled group, composed of 327 students who had no school behavior problem, and the studied group which also subdivided into the studied group 1, composed of 102 students who had less school behavior problems, and the studied group 2, composed of 209 students who had severe school behavior problems. The data were collected through questionaires during November-December 1987. The statistics used for testing hypothesis were Chi-Square Test, ANOVA, ANCOVA, and MCA. The results indicated that adolscents in the controlled group had the most conflict with their parents just like the both studied groups. Both groups of adolescents also had the least conflict with their parents in the same categories. When comparing students who had school behavior problems with the controlled group, it was found that students in the studied group showed more conflict scores with their parents than the controlled group with statistically significant differrence (P < 0.05). It was found that mothers occupation, mothers income, types of child rearing and the two of covariates: fathers education, mothers education were statistically significant related to parent-adolescent conflictl. All factors could describe the variation of the conflict only 18.5%. It was found that only the types of child rearing was still related to parent-adolescent conflict. All factors could describe the variation of the conflict only 18.8%. Adding that, the adolescents in both groups were found to have more conflict with their mothers than their fathers.