Abstract: The flora of Culai Mountain is one of the typical representatives of the Southcentral of Shandong Province with characteristics as follows:it is abundant of species,containing 640 species of 368 genera,belonging to 114 families;it is notable in dominant family and genus phenomenon;the flora is ancient and it has not obvious phenomenon of endemic species;the single-species and few-species genera of the angiosperm are rich;the types of distribution are various and geographical elements are complex;the dominance of temperate elements is obvious and tropical elements are plentiful,this means that it has something in common with tropical flora and it indicates the characteristics of plants crossing.