Abstract: Objective]The objective of this article is to seek the influences of different enclosure years on the growth of sagebrush desert-Seriphidium transiliense.[Method]Two types of enclosure were set up re-spectively in four years and two years in the test,and the pasturable grassland in the whole year was taken as a control.In different treatment plots,respectively in the vigorous growth period of the plant,squaring stage and summer dormancy and flowering and fruiting period,the different fence years Seriphidium transiliense com-ponent of reproductive allocation were determined.[Result]Enclosure has an obvious effect on average plant height and cluster size of S.transiliense-edificatory,the average plant height and cluster size of four-year enclosure are higher than those without enclosure.And in different growth periods,there was a big difference in both average plant height and cluster size between four-year enclosure and non -closure (P<0.05 ), while the difference with two-year enclosure was not so big maybe because of a relatively short enclosure peri-od.Generally speaking,the overall distributive structure of stock biomass of S.transiliense was root >stem>leaf.As season changes,changes of biomass of root system,biomass of stem,biomass of leaf and total bio-mass of S.transiliense in different enclosure periods were basically the same,which meant that there was no influence of season change on biomass of each component,while different enclosure periods had certain influ-ence on biomass of each component.With the increase of enclosure period,there was obvious change in bio-mass of each component.However as season changes,there was no rule in variation trend of distribution of bi-omass of each component in different enclosure periods.Merely with the increase of enclosure period,distribu-tion of root biomass decreased and distribution of stem and leaf biomass increased.[Conclusion]As the season changes,the largest in above-ground biomass of S.transiliense is the type of four-year enclosure;biomass of root,biomass of stem,biomass of leaf and total biomass of S.transiliense are basically the same,while the largest in the ratio of root and stem is non-enclosure.Therefore,enclosure plays a significant role in impro-ving phytomass and lowering ratio of root and stem.