Abstract: It is now known that there are 1010 species(varieties)of seed plants in the Castanop sis kawakamii nature reserve in Sanming,Fujan,which belong to 434 genera and 145 families,In general,its origin is rather ancient.The analysis of floristic geographic elements indicated that the percentages of pan-tropical and tropical elements are high.The result of the fuzzy cluster analysis showed that the division of formation is in agreement with the method of the important value of each species in its vegetation layer identified by the dominant species in each vegetation layer.Nature vegetation 3 formation:1.Form.Castanop sis kawakamii,2.Form.Castanop sis carlesii,3.Form.Castanopsis fargesii.Planted vegetation 5 formation:1.Form.Pinus massoniana,2.Form.Cunninghamia lanceolata,3.Form.Fokienia hodgnsii,4.Form.Phoebe bournei,5.Form.Phllostachys pubscens.