Abstract: Dangerous rock mass is a kind of characteristic phenomenon occurred commonly in mountainous areas.At present,studied on deformation development characteristics,failure mechanism and engineering countcmieasure of dangerous rock mass have been the hottest and difficult problem of engineering geology at home and abroad.Based on the engineering example of dangerous rock mass of Xinxiang town,it has been studied systemically on deformation development characteristics,stability numerical methods and countermeasures of dangerous rock mass based on the detailed analysis of the regional geological environment.