The goal of this article is to estimate the change in plasma catecholamine when ST-36 (Leg Three Li) and HT-7 (Spirit Gate) among the meridian points were stimulated for the group of the young and the old, using SSP therapy, thereby clarifying its effects on the responses of catecholamine that generates various physiological effects on the body, in particular, the effects on catecholamine, in the senile body, thereby providing its availability for physical therapy for the old, which is now the major concern of the society. As for research subjects, a total of 10 healthy male and female adults in their twenties were selected as the group of the young, and 10 old male and female, aged over 60, as the group of the old. The findings are as follows: When SSP stimuli were applied to ST-36 and HT-7, as for the change in the content of plasma catecholamine for the group of the young, norepinephrine significantly increased from $309.40{pm}23.81pg/ml$ before stimulation to $374.90{pm}35.31pg/ml$ 20 minutes later and to $406.70{pm}42.43pg/ml$ 40 minutes later (P < 0.05); epinephrine significantly increased from $100.70{pm}28.55pg/ml$ before stimulation to $95.70{pm}24.16pg/ml$ 20 minutes later and to $128.80{pm}25.02pg/ml$ 40 minutes later (P < 0.05); and dopamine showed no significant differences as its content was $245.20{pm}40.01pg/ml$ before stimulation, $233.50{pm}59.56pg/ml$ 20 minutes later and $250.90{pm}56.13pg/ml$ 40 minutes later.