In order to measure the bio-signal of the plant, an electrode capable of measuring the microvoltage in the plant, unlike the conventional method, is placed on the stem of Angelica-gigas and on the stem, root and head of the edible vegetable bean sprouts directly inserted. Angelica-gigas and Bean sprouts were experimented while growing indoors while supplying solutions containing water and new materials provided by Dasan Pharmaceutical. As a result of the experiment, it was shown that both Angelica and bean sprouts fed with the solution showed a relatively high potential difference (size of the biological signal), which was measured at the surface temperature of the leaves and in the stem of the bean sprouts It was confirmed that the temperature of the leaves and bean sprout stem fed with the solution over the entire time were maintained at a high level. These results show that the internal temperature of the plant is maintained at a high level when the biological signal is high, as in the previous research results.