The silo is an important device for material storage,and material discharge property is one of important pa-rameters in the silo design.Continuous discharge capacity of the silo is different from the discharge rate when the container is filled with liquid.For liquid,the level varies with the flow speed and the discharge rate,while for particle materials, the flow speed is constant.The paper mainly introduces the method for calculating the silo discharge capacity through analy-sis of arch formation and collapse in the silo,and presents the formula for the discharge capacity.%筒仓是物料储存的重要设备之一，物料的流出特性是筒仓设计中最重要参数之一。筒仓的持续卸料量不同于容器充满液体后的卸料量，对于液体，其液位的变化随着流速与卸料量的变化而变化，而对于颗粒状物料，其流速是恒定的。文中主要介绍了通过分析筒仓中拱的形成和坍塌来计算筒仓的卸料量的方法，给出卸料量计算公式。
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