Abstract: In view of problem that static plan management method in text-form is not accurate enough to guide rescue work when coal mine accident happened, and it is hard to formulate emergency plan feasibly, a emergency plan management system of coal mine based on case-based reasoning was designed. According to problems of mismatch of feature attribution between actual cases and history cases, differences similarity algorithm was proposed which was combined with nearest neighborhood matching method in case-based reasoning. This algorithm can retrieve the highest similarity historical cases from library plans, and then improve the efficiency of rescue program generating. For the problem that corresponding plan becomes difficult to find since the case base growing, a hierarchical search strategy was presented. The practical application results show that the emergency plan management system of coal mine based on case-based reasoning is better to meet requirements of timeliness and pertinence of coal mine emergency rescue compared with the traditional coal mine emergency plan.