NOVELTY - A natural tropical fish geothermal transferring method in temperate winter involves utilizing places around bottom or slope of shore, or digging sewer. Sewer is dug 0.6-6 m deep from the ground and to width of 0.6-6 m and length of 1-1000 m. Top of the sewer is filled with dirt to the ground. Sewer has multiple openings. Tropical fishes are placed in normal water level of 10-20 cm on top of the sewer. Sewer openings are provided with iron mesh door. Water places in the sewer are formed for fishes to hand out freely into the groundwater.    USE - Method for geothermal transferring tropical fish in temperate winter naturally.    ADVANTAGE - The method enables geothermal transferring tropical fish in temperate winter with 50% cost reduction, safety and reliability, saving transportation, reducing winterfell substandard specification loss of fishes, and promoting breeding tropical fishes in temperate agricultural industrialization, intensification and modernization of reform policy with practical significance.    DETAILED DESCRIPTION - A natural tropical fish geothermal transferring method in temperate winter involves utilizing places around bottom or slope of shore, or digging sewer to depth at which fishes can live at ground water temperature. Sewer is dug 0.6-6 m deep from the ground and to width of 0.6-6 m and length of 1-1000 m. Distance of the sewer from the ground is 0.4-16 m. Top of the sewer is filled with dirt to the ground. Sewer has multiple openings. Underground channel is set with vent hole, and has only one opening far away from the opening. Tropical fishes are placed in normal water level of 10-20 cm on top of the sewer. Sewer has two openings in south-north direction. If the sewer has more than two openings in south-north direction, other opening position is considered for determination. Opening in the middle of the sewer is 30-50 m. Sewer opening in the bottom is 0.2 m lower than bottom of the middle opening. Sewer openings are provided with iron mesh door. Water places in the sewer are formed for fishes to hand out freely into the groundwater.