A complex farming method is provided to grow shrimps, which is well-known as a marine life living only in clean environment, and to cultivate rice plants at one time by inputting the shrimps to a rice paddy field. A complex farming method is performed by inputting shrimps to a transplanted paddy field; therefore, the cultivation of rice and the rearing of shrimps are accomplished at a time. The shrimps represent Palaemon paucidens or Neocaridina denticulata. The amount of shrimps inputted into the paddy field is 10~30kg per 1,000m^2. Freshwater snails are inputted before the shrimps. The rice plants are selected among white rice, black rice, germinated brown rice, red rice and green rice. The reproductive output of the shrimps is 20.0~30.0% represented by dry weight of eggs/dry weight of female shrimps. The gonadosomatic index of the shrimps is 0.1~30.0 represented by dry weight of ovaries/dry weight of female shrimpx100. The crustacean length(CL50) of the shrimps is 6.0~9.0mm.
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