Background: There are many risky behaviors that threat adolescents and must receive specific attention. Research has shown that personality pattern behaviors have a significant relationship with risky behaviors. Objectives: The objective of this study was to clarify the role of personality pattern behaviors in risky behaviors of high school students in Chabahar city. Patients and Methods: Three hundred high school students from Chabahar city were selected at random for this study and filled Type A and B pattern behavior profile and Type D personality and sensation seeking (Type T Personality) questionnaires. Results:To analyze the data, Pearson correlation coefficient and multiple stepwise regression were applied. Results revealed that type of sensation seeking (Type T personality) and Type A behavior pattern were significantly correlated with risky behaviors. Type D personality had a significant negative correlation with risky behaviors. Type B behavior pattern was not significantly correlated with risky behaviors. The results of multiple stepwise regressions demonstrated that type A behavior pattern, type D, and type T personality explained 11.4% of the variance in risky behaviors, respectively. Type T and type A personality was a positive and type D personality was a negative predictor of risky behaviors. Conclusions: In conclusion personality pattern behaviors had a unique role in risky behaviors of high school students in Chabahar city and the training and education organization should identify their personality patterns to prevent risky behaviors among them.