This study presents a case-based reasoning (CBR)-based method that supports the selection of appropriate similar cases for the review of the unit cost in total project cost analysis. CBR is a technique for solving new problems by retrieving and revising the similar cases in the data set. This method was developed by applying the "retrieving" of CBR. First, the similarity measurement model for retrieving was identified by defining attribute importance and weights. Second, the model computes the case similarity scores. Finally, using the similarity score as an index, the method select the most similar cases from the data set. Based on administrative project case studies, the proposed method was validated.