The invention discloses a method for improving the yield of overwintering ricefield eels bred in net cages of a pond. The method comprises the following steps of injection of deep water, using of the high net cages, nutrition regulation and control, culture of fertilizers and water, arrangement of nests and thickening of water plants. The physique of the overwintering ricefield eels is improved by nutrition regulation and control, and the anti-stress capability of the overwintering ricefield eels is improved; an overwintering environment of the ricefield eels is changed; and by measures of injection of the deep water, using of the high net cages, thickening of the water plants, culture of the fertilizers and the water, arrangement of the nests and the like, the good overwintering environment for the ricefield eels is created, and stress stimulation of change of the temperature of the environment on the ricefield eels is relieved. By the method, the yield of the overwintering ricefield eels is above 95%, and reduction of the weight of the overwintering ricefield eels is below 5%.