One of the most important parts of the supply chain is the supplier. Suppliers play a role in supplying materials that will be used in the production, it is necessary to make a selection in selecting suppliers to get the criteria that consumers want. Several criteria are considered when selecting suppliers; quality, prices & on-time delivery. To maintain the above criteria, especially quality, it is necessary to evaluate & monitor suppliers. Various manufacturers already have supplier quality monitoring systems but have not considered in detail the critical level of non-conformity that occurs in materials and if there is a quality problem, the Quality Control section is often slow in making decisions so there can be a decrease in product quality. Therefore, this research is conducted to obtain a Standard Operating Procedure (SOP) for the design of a supplier quality monitoring system and provide alternative options in handling quality problems in supplier’s materials that occur with quick and precise decision making. To design a supplier quality control system that considers the level of non-conformity, the method used is Quality Function Deployment (QFD). In this study, Voice of Customers (VOC) were obtained through experts’ interviews in the field of quality to find out the manufacturer's wishes regarding the actions taken for handling non-conformity according to the level and level of importance for the customer. Meanwhile, for technical requirements, it is a list of several actions/follow-ups that will be carried out to suppliers.