一些企业在采用集中采购模式获得的同时，并未注意到由于交易的复杂性向供应链各极转移而导致供应商等其它企业工作大量增加这一事实，由此引出在集中采购模式下进行供应链复杂性分析的必要性。在此基础上，建立了企业供应链复杂性分析的框架，提出了供应链复杂性分析的5个阶段，并举例说明了由集中采购所产生的复杂性在采购企业及其供应商之间的转移。在数据分析的基础上，给出了一个通用的数学模型用于定义供应链上各个实体间的复杂性关系。以达到：1）通过对各供应链参与者的比较，得出企业间的关联关系，预知供应链关系改进的效果。2）通过系统地比较流程、生产线和产品，指导企业内部生产的变革。

While lots of enterprises use the single point buying model to make profits, few of them noticethe fact that the business complexitieswill finally shift to each pole of the supply chain, therefore, greatly increaseother enterprises'workloads, especially for suppliers. This shows the necessityof supply chain's complexity analysis under the single point buying circumstances. On the basis of the previous research, the frameworkof complexityanalysis for enterprises is built.It is pointed out that the five stages for the complexity analysis of the supply chain are advanced, and an exampleis given to show how the complexitiescaused by single point buying shift betweenbuyers and suppliers. On the basis of data analysis, a general mathematics model which could define the complexity relationships among the entitieson the supply chain is given and the model can help enterprises to Through comparingeach participants on supply chain, their relationship canbe clarified, and the effectof the improvement of the supply chain relationship can be predicted Through systematically comparing process, product line and production, enterprises' inner productiontransformcanbe guided.

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