A prevention apparatus of dissolved oxygen deficiency in closed basin such as pond, lake and dam is proposed, and the possibility of the practical application of this equipment is indicated. This equipment is consisted of a vertical rotating shaft, eight radiation partition plates and two parallel disks. The horizontal radiation jet is formed by rotating the disks at the near water surface and is induced the vertical circulation flow in the cIosed basin. As the result, the dissoIved oxygen deficiency at the bottom will be restrained.
