The invention provides a control method for keeping the body surface red quality of Kuchibeni-Kohaku cultured in an indoor fish tank. The method comprises the steps of keeping dissolved oxygen of water in the fish tank, prolonging illumination time, additionally feeding Kuchibeni-Kohaku with self-made bait, determining the feeding mode of Kuchibeni-Kohaku, keeping water to be healthy and adjusting the pH of water. Compared with the prior art, by adding dissolved oxygen, conversion of ammonia nitrogen and nitrite in water is promoted, the content of harmful chemical substances is lowered, and the feasible method for adding illumination is supplied; by adding the self-made bait, the method is scientific and reasonable, the Kuchibeni-Kohaku body surface red quality is kept and dispersed; by adding coral sand or oyster shells in a filter material in cooperation with medical stone, the effect of stabilizing the pH of water can be achieved; according to the method, due to equalizing regulation of dissolved oxygen, illumination, feed and pH, the red quality is condensed on the body surface of Kuchibeni-Kohaku, red is more rich, meanwhile, the body surface is whiter, and the whole color is brighter.