Regardless of light conditions during the growth of grapevines, up to 20-35klx, their photosynthetic rate and water-use efficiency increased as light intensity increased. The transpiration rate and stomatal conductivity decreased under low temperature and high illumination (20℃, 25klx), but otherwise, they increased as light intensity increased. Under the same temperature, if treated with low illumination, the dark respiration rate, transpiration rate and stomatal conductivity were high, but the water-use efficiency was low. The photosynthetic rate varied considerably depending on the varieties. Light compensation and saturation points of many varieties were lower than those under low light condition. Therefore, eventhough shade leaves can use a relatively low light, their drought resistance seems to be weaker. Under the same light condition, if treated with high temperature, the photosynthetic rate, light compensation point, dark respiration rate, transpiration rate and stomatal conductivity were high, but corresponding decrease of the water-use efficiency was observed. Therefore, when exposed to high temperature for long period, the physiological responses of grapevines would be vigorous, but their drought resistance seems to become weaker.