Product knowledge reuse is more emphasized by discrete enterprises nowadays. But their small batches, multi-product, and high frequency new products development restricts them to reuse this. Analyze demands of knowledge reconfiguration in discrete enterprise. Propose a product feature based mathematical expression. Promote knowledge nodes of product-feature-model. Then use these models to fulfill KR process in KMS. Increase discrete enterprise’s adaptability and creativity in the nowadays rapidly changing-competitive business environment.