The invention relates to a process to remove precipitable particulates in fish pond, also relating to a fish pond system. The process to remove precipitable particulates in fish pond is characterized by employing a normal line located at the water outlet which is arranged at the bottom of the fishpond as a central axis, driving water of the fish pond to rotate around the central axis, enabling the precipitable particulates in fish pond to gather at the water outlet at the bottom of the fish pond, and opening the water outlet to drain the precipitable particulates. The fish pond system comprises a circular fish pond, the fish pond comprises a bottom of the pond and pond walls, a water outlet is disposed on the central axis of the bottom of the pond, the water outlet is connected with drainpipes, and the drainpipes are equipped with drain valves. The fish pond system is characterized in that the fish pond system also comprises a water-power device which enables water of fish pond to rotate around the central axis at the bottom of the fish pond. The invention solves the problem of fussy operation, high energy consumption and large water consumption in the existing process to remove precipitable particulates in fish pond.