Abstract: As the reference standards of the biotope mapping,naturalness assessing and grading are very important to the prezoning and later design of the natural forest management.Based on the concept of the degree of closetonature in the paper,the key technologies of evaluating the closetonature forest were analyzed from the evaluation levels,indicators,methods.The evaluation progress,relevant nature degree and degree of the ecological disturbance were reviewed.Considering the structure heterogeneity of different forest communities on the spatial scale,spatial pattern and the interference degree,and combing the qualitative system classification with quantitative indicator according to the forest succession theory,the evaluation system of close to nature forest was established. It provides a theoretical and technical support for the community zoning,mapping and management of the degraded forest.