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Rangeland is one of the vital resources in natural cycle that nowadays because of overuse these resources are at risk.Problem recognizing is the first step in recourses management.Multi criteria decision making that Analytical Hierarchy Process (AHP) is one of them,is the method for problem recognizing and ranking.These methods use ideas of different experts.The aim of this research is investigation of effective factors on range degradation using expert ideas and multi criteria decision making in Gaznasara rangeland,a part of Mazandaran province.