Abstract: Aneurolepidiurn chinense (Trin.) Kitag. is a rhizome grass. Among the total earing plants of the population in natural cutting grassland, 87 % was winterness plants. The oldest tillering node was four age, and its life time would reach five years. The plants of one and two age held the absolute dominant position and their proportion was 92.5% in the age structure of developing plants from the tillering nodes. The productivity of one age plants was the highest among plants of the total ages, whereas the vitalities of plants were evidently weakened by the third age. On the age structure, A. chinense population in the cutting grassland was a type of mixed population which was an expanding and a stable population. The strategy of asexual propagation, in which the age structure of the population would be regulated by developing plants from rhizome end, and the mechanism of biology and ecology on natural sustaining renovation of A. chinense grassland were comprehensively analysed.

Key words: Aneurolepidium chinense, Tillering node, Asexual propagation, Age sturcture, Age spectrum, Strategy of population