In this paper, we studied seasonal variation of endogenous IAA, GA3,ZR and ABA content of Leymus chinensis, Agropyron michno, Stipa grandis, Cleistogenes sguarrosa, Koeleria cristata, Carex korshinskyi, Allium bidentatum, Artemisia frigida, Kochia prostrate and Potentilla acaulis in different restoring succession stages, which were determined by ELISA in the growing season in 2005. At the same time we recorded the phenological development and growing regulation of each kind of plant. The experimental results are as follows:1, In the Inner Mongol typical steppe community, Stipa grandis, Koeleria cristata , Artemisia frigida and Kochia prostrate turn green relatively early. Cleistogenes sguarrosa is latest. Carex durivscula and Potentilla acaulis grow earliest. Growing regulation of ten kinds of plant under different communities is that the plant grows fast in the nutrition stage and reaches the maximum in the heading stage, thereafter the growing velocity slackens gradually. Over-grazing makes the plant in the degenerative community grow slow, of the variation of plant endogenous hormones is the direct reason.
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