Abstract: A method of forming an artificial snow layer is disclosed. Water content is added to to atmosphere above a floor by a humidifying device, or water mist is added to the atmosphere by a water-mist supplying device. The water content or the water mist is frost-frozen by a refrigerating device 6 incorporated at the floor, thus forming on the floor an accumulated frost layer as an artificial snow layer. A method of maintaining the formed artificial snow layer is also disclosed. After the formation of the artificial snow layer, an atmosphere refrigerating device is stopped or reduced in its operation so as to release the maintenance of the atmosphere below the freezing point. Then, the refrigerating device of the floor is operated to prevent melting of the formed artificial snow layer so as to prevent coagulation of water content in said atmosphere on a surface of the artificial snow layer through humidity adjustment of the atmosphere by a humidity adjusting device.

Abstract: A method of forming an artificial snow layer is disclosed. Water content is added to to atmosphere above a floor by a humidifying device, or water mist is added to the atmosphere by a water-mist supplying device. The water content or the water mist is frost-frozen by a refrigerating device 6 incorporated at the floor, thus forming on the floor an accumulated frost layer as an artificial snow layer. A method of maintaining the formed artificial snow layer is also disclosed. After the formation of the artificial snow layer, an atmosphere refrigerating device is stopped or reduced in its operation so as to release the maintenance of the atmosphere below the freezing point. Then, the refrigerating device of the floor is operated to prevent melting of the formed artificial snow layer so as to prevent coagulation of water content in said atmosphere on a surface of the artificial snow layer through humidity adjustment of the atmosphere by a humidity adjusting device.