Leymus chinensis is dominant species in eastern regions of the Eurasian Steppe. The dominant position was obtained as a result of spiral elongation for Leymus chinensis population through clonal growth year by year. For Leymus chinensis population, a spiral ring meant a growing season; furthermore, a growing season included many growth stages when they respectively experienced different growth strategies. From late May to late July it was spreading stage when mature parent shoots elongated young rhizomes, adopted elongation strategy; from late July to late October occupied stage of daughter shoots when buds come up and became daughter shoots, developed occupation strategy; from late October to next late March dormancy stage; from late March to late April prior stage of growth; from late April to late May growth and consolidation stage when daughter shoots grew and developed into mature parent shoots, firmly occupied the area, pursued consolidation strategy. Moreover, clonal spacing evading risk strategy was adopted in order to not only avoid competition between clumping shoots and spreading shoots through both of which separating in parent shoots, but also fight against outward competitors through source sharing as the interlinking of rhizomes; meanwhile sexual propagation evading risk strategy in order to avoid thorough extinction, when suffering from tremendous changes of environment, through getting seeds of genetic heterogeneity of population; twenty-eighty rule through 20% spreading shoots for occupation of new area and 80% clumping shoots for occupation of previous area. Therefore, L. chinensis become a dominant population in the local area through its spreading, occupation, consolidation, then, spreading again, occupation again, and consolidation again. This creates a scientific backing for improving productivity of shoot and seed and also for the restoration of degraded grassland ecosystems.