Abstract: The identical work-in-process (WIP) must be differentiated according to different customization processes for postponement manufacturing. Due to uncertain process quality, it is difficult for traditional material requirement planning (MRP) approach to satisfy the real-time requirement of postponement differentiation. This paper briefly introduces how the MRP approach is adapted for postponement manufacturing at first. A dynamic adjustment approach based on the real-time yield rate is then proposed. The algorithm for implementing the dynamic adjustment approach is also developed. A case study shows that this proposed approach can adjust material requirement plans dynamically according to the real-time quality fluctuation at every stage. As a result, decisions on differentiation for process customization can be made more wisely.