重心法是一种模拟方法。这种方法将物流系统中的需求点和资源点看成是分布在某一平面范围内的物流系统，各点的需求量和资源量分别看成是物体的重量，物体系统的重心作为物流网点的最佳设置点，利用求物体系统重心的方法来确定物流网点的位置。-Gravity method is a kind of simulation method. This method will logistics system of demand point and resources are distributed in a point as a plane within the scope of the logistics system, each point of demand for the resource and as the weight of the object respectively, the object system as the center of gravity of the logistics nodes on the best set point, use the object system　the centre of the method to determine the position of the logistics network.