Abstract: Comparable sales method is closely related to mining rights market, so it is the most acceptable mining right evaluation method for both parties involved in the transaction. However, when applying the comparable sales method, it is necessary to solve the problems of time-consuming and laborious searching for the reference mining right information in the geological data database which is consistent with the conditions of the deposit to be evaluated and how to screen "recent similar trading environment". Therefore the fuzzy decision method was used to optimize the reference mining right information in the geological data database. The hypothesis of increasing comparable factors of mineral products and mining right market conditions was put forward. And then, a database of 24 mining rights cases was established and optimized by this method. The results of the study showed that the O, C, and K deposits were most similar to the comparable factors of the deposits to be evaluated. However, they were still not met the conditions of the comparable sales method as the high mismatching of the comparable factor 2. The feasibility analysis showed that this method could screen highly similar mining right information. The feasibility analysis showed that this method could screen highly similar mining rights information. And then, the rationality of increasing the comparable factors of mineral products and mining right market conditions was demonstrated with the example analysis.