A process of activating water by leading water to pass through energy concentrated fields which are generated in particles, being composed of a single elementary material selected from a group of silicon, titanium, nickel and samarium or composed of fluorocarbon, of which the single elementary material or the fluorocarbon is placed at a position where wave energy intrinsic to each atom or said fluorocarbon is amplified and constructing activation structural bodies are concurrently carried out with increasing quantity of dissolved oxygen in the water. Water can be activated without externally supplying energy or with a little energy.