Abstract: Biodiversity is the basis for the existence and development of human begins，this paper discussed the general situation of plant biodiversity in the nature reserve of meihua mountain，including species diversity、genetic diversity and ecosystem diversity，the characteristics analysis of the plant biodiversity in the nature reserve of meihua mountain. The research indicated that plant biodiversity in the nature reserve of meihua mountain is abundant，There are vascular bundle plants 1628 species 734 genera in 184 families，with ancient Origination，the floral geographic elements are complex，vertical zonal of ecosystem，secondary of natural vegetation.