Abstract: Studies on 21 elements contents of 87 plant species and their regional differentiation inKarakorum and Kunlun mountainous regions show that the Ca, Cr, Cd, Fe and Vcontents of them are higher than those of higher plants, while Pb and Pcontents are lower.The element contents of same plant species on various sites are different.Halophytic vegetations on desert have a higher content of Na, K, Mg and P, and the plants on alpinemeadow and glacial fringe have a higher content of Ba, Ca, Fe, V and Ti.For variousvegetation types, The variation of Na/Kis maximum, that of Ca/Mg is less, and that ofFe/Al is minimum.Their variation coefficients are respectively 153.5, 20.5 and 15.9%.

Key words: Karakorum and Kunlun Mountains, Element content in plant, Regional differentiation, microbial degradation, cyanobacterial toxin, natural organic matter., coupling process