The occurrence of forest fires is unavoidable in many cases,but the understanding of ecological status after forest fires is of great significance for post-disaster ecological restoration and related forestry activities.Therefore,it is very important to construct an ecological status evaluation index system of forest fire.After analyzing the construction methods of the evaluation index system of ecosystems at home and abroad,this paper has chosen the forest ecosystem disturbedby forest fire disturbance as the research object.Through the index selection,frequency statistics,feasibility analysis and sensitivity,the evaluation of ecological status of forest ecosystems after forest fires was preliminarily established,which was constructed by productivity,regeneration capacity,soil conditions,microbial factors,site conditions and biodiversity,and 23 indicators of post-forest fire ecosystem assessment system.We use the entropy method to determine the indicators of the weight of the indicators.This method,which combines qualitative analysis with quantitative analysis,can achieve the goal of using the least indexes to reflect the maximum amount of original information.The application of this research idea and method should enrich the theory and method system of forest ecosystem evaluation research to a certain extent.