Abstract: The characters of Ca, Mg contents of the Aneurolepidium chinense grassland harvested by cutting in Northeast China were studied. Results showed that: In A. chinense community, the Ca, Mg concentrations of root were the highest among the organs and were higher in the peak growing season than in other time. The seasonal variation curves of Ca, Mg accumulation of the aboveground biomass of A. chinense have a "S" shape, while those of Cares duriuscula and Heleocharis acicularis were bimodal. The Ca, Mg accumulations in the underground part of the community were account for 97% and 92% of the total accumulations of the whole community. The Ca, Mg accumulations in the community were account for 0.05% and 0.03% of the total reserves of the soil, account for 52.20% and 14.62% of the soluable+exchangeable reserves of the soil respectively. The accumulation of Ca in all organs of plant was higher than that of Mg.