Here to fore, the blood-pressure measurement, which is fundamental in the health supervision of patients suffering from hypertension, has been done only at their resting condition, that is only the static blood-pressure has been dealt with. But as regards the blood-pressure change of hypertensives during their work-time, the author suppose it would be necessary to study it in its dynamic conditions. And we made an inquiry into the blood-pressure change of hypertensives during the step-up test made of them (30cm high 25 time a minutes). The results were as follows i) The difference of blood pressure existing at their rest time between hypertensives and non- hyper-tensives remained unchanged even under the effect of the test. But 3, 4 or 5 minutes after the work began, the blood-pressure increase became more remarkable in the hypertensives and 3 minutes after the releasement from work the blood-pressure became less than at rest, and a negative phase appeared. ii) In a short time exercise, hypertensive showed a notable change in blood pressure and a negative phase was still to be seen even ten minutes later.