货流是指货物在地域上的定向移动。货流的种类、结构、规模和流向，不仅是衡量区域经济对外联系的深度与广度的重要指标，而且是分析区域经济发展水平与特点以及产业结构层次的重要依据。货流的各类与结构1．出、入境货流总量；1995年山西省出、入境货流总量（不包括省内货流） Freight flow refers to the directional movement of goods in the area. The type, structure, scale, and direction of cargo flow are not only important indicators for measuring the depth and breadth of the external relations of regional economies, but also an important basis for analyzing the level and characteristics of regional economic development and the level of industrial structure. The types and structures of cargo flow Total volume of outbound and inbound cargo flows; total amount of outbound and inbound cargo flows in Shanxi Province in 1995 (excluding intra-provincial cargo flow)