Abstract: This paper mainly studies the extinction risk and the classes of conservation priority of wild plants in Helan Mountain Nature Reserve in Ningxia of northwestern China, based on field investigation from 2006 to 2008, literature and specimen examination using quantitative methods. The degree of endangerment was evaluated quantificationally by 5 indices, i.e. distribution frequency of linetransect, distribution frequency of sample plot, existent abundance, distribution mode and exclusiveness. The results show that there were 14 endangered species, 28 vulnerable species, 55 near threatened species and 620 secure species in this nature reserve. We evaluated the order of priority for conservation of plant species using the comprehensive evaluation by endangerment index, genetic loss index and utility value index. 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