In the process of product design, it is usually difficult for enterprises to timely and effectively accumulate lesson-learned knowledge, which should be revised several rounds by appropriate experts in a cooperative, multidisciplinary team to make sure of its accuracy and integrity. This study proposes a model of an inner-enterprise wiki system (IWkS) integrated with an expert finding framework to support the accumulation of lesson-learned knowledge in product design. By combining wiki’ characteristics, the expert finding framework considers both users’ expertise relevance, and social importance in IWkS. To validate our expert finding approach, some experiments are done in a famous ship-building company in China. Meanwhile, a working scenario of the IWkS integrated with an expert finding framework for knowledge accumulation is shown.