Abstract: Erythrocyte membrane Na⁺-K⁺-ATPase and Ca²⁺-Mg²⁺-ATPase activities in patient with EH are lower than that in controls,while no significant difference of those two ATPase activities was found between the parent patients and their children.Both Na^2＋-K⁺-ATPase and Ca^2＋-Mg^2＋-ATPase are not correlated to blood pressure.The resuls indicate that the decreased erythrocyte membrane Na⁺-K+-ATPase and Ca^2＋-Mg^2＋-ATPase activities maybe the common charcteristics of EH patients and their hildren.These properties may not be the causes for hypertension,nor be the predictors for the development of hypertension.