Hydroponic fodder system is not easy to be affected by external climate conditions, which can ensure the balanced and stable annual output of forage and make up for the shortage of green forage in winter. Because of its unique advantages of low energy consumption, easy operation, less maintenance and low operation cost, fodder system has great application potential and environmental protection significance in the world, especially in areas with land depletion, salinization, desertification and scarce cultivated land.