Abstract: According to the flora balance theory and the research results from the project of "Chinses Seed Plants Flora",China's floristic nature has analysed in the paper. It is subtropical nature as tropical elements being 50.2% and the temperate ones 49.8%,i.e. they are basically balance. However,there are obvious regional differentiation. The tropical elements reach 75%-85% in tropical regions,40%-60% in subtropical,15%-25% in temperate ,and only 5%-25% in cold-temperate,high-cold and Central Asian desert.They become lower and lower gradully from south to north but the temperate elements are on the contrary.The relationships among different geographical elements are dtudied based on the cofficient of similarity between every two elements of families belonging to the 15 distribution patterns of Chinese seed plants genera.

Key words: Flora, Distribution patterns or geographical elements, Coffiecient of similarity, China