Reduction production of polycrystalline silicon

A reduction production process of polycrystalline silicon is provided. The process includes providing a reduction furnace; mounting a plurality of silicon core rods in the reduction furnace, and controlling the area of silicon core growing surfaces in unit volume in the furnace; feeding a gas mixture raw material containing hydrogen and trichlorosilane into the reduction furnace; controlling the temperature in the reduction furnace; allowing polycrystalline silicon to grow on the silicone core rods, and controlling the surface area of polycrystalline silicon finally formed in unit volume in the furnace; stopping supply of the gas mixture raw material; and feeding hydrogen until the temperature in the reduction furnace decreases to a preset value. 多晶硅的还原生产方法，包括：提供还原炉；将多个硅芯棒安装在还原炉中，控制炉内有效单位体积内硅芯生长表面面积；向还原炉中通入氢气和三氯氢硅混合气体原料；控制还原炉内温度；在硅芯棒上生长多晶硅体，控制炉内有效单位体积内最终长成的多晶硅体表面积；停止通入混合气体原料，并切换为通入氢气，直至还原炉内温度降低至预定值。