Objective: To explore the express of type A behavior in families with and without history of hypertension Method: 178 members of 40 families with history of hypertension and 27 families without completed type A behavior questionnaire Result: Type A behavior was not associated with hypertension 35 2% children of both parents with type A was type A, 34 4% children of both parents with type B was type B Children of one parent with type A were more commonly manifested as type B Conclusion: Type A behavior has no association with hypertension Behavior pattern itself has family constellation