In order to explore accumulating characteristic of moss as a biological monitor to environmental pollution

cultured Physcomitrella patens of the second generation was grown for 45 days in a specially prepared nutrient medium containing different concentrations of Pb

Fe or Cr

or mixture of Fe-Pb

Fe-Cr and Fe-Cu.Elemental contents in the moss tissue were determined using SRXRF （synchrotron radiation X-ray fluorescence）.Cr and K distributions in leaf and stem of the moss were obtained using micro-SRXRF.The results showed that in the sample groups of both types of the medium containing a single heavy metal or the metal mixture

the contents of polluted metal elements in the moss were correlated to the concentrations of corresponding elements in the culture medium. The moss injury was greatly aggravated with increasing content of heavy metal element.Under the contamination of heavy metals

the ability of moss to absorb nutritive elements （K

S） was declined sharply.Also due to the antagonism of excessive Cr

the content of K element deposited in moss stem decreased gradually.