When a company attempts to improve the performance of SCM, it is crucial for it to understand the quality of the supply chain network. Hence, the five steps of the six sigma model are designed to facilitate continuous improvement and process control. The continuous improvement itself is a dynamic process of the supply chain network. When multiple dimensions are simultaneously considered in evaluating the overall competence of a supplier, the performance socre of each supplier can be obtained by the PCA method and DEA approach. The average technical efficiency score obtained through CRS model is 0.830 and the average efficiency score obtained through VRS model is 0.944 which is higher than the CRS score. Suppliers with high performance scores are likely to sustain a high level of capabilities, and are better candidates for inclusion in an optimized supplier base. So improvement in the quality of all supply chain processes reduces costs and improves the level of customer services. Future research can be possible by taking different factors relating to the supplier side by the help of multi-criteria decision making approach like Fuzzy Logic and others.