The seasonal snow cover has a profound effect on plant growth and reproduction. In order to clarify the change rule of each organ biomass, nutrient content, reproductive allocation and functional traits of Saussurea nigrescens under different snowpack. Our experimental site is located in Hongyuan County, the eastern margin of the Qinghai-Tibetan plateau. Control experiments of snow gradient (CK, S0, S1, S2, and S3) were carried out by manual accumulation. The characteristics of stem, leaf and fruit nutrient content and reproductive allocation were measured by indoor analysis method under different snowpack. The results showed that:1) the change of snowpack did not significantly change the reproductive allocation of Saussurea nigrescens, but the removal of snow cover (S0) significantly reduced the biomass of vegetative organs. 2) Under different snow cover treatments, there was a positive linear relationship between individual size and reproductive organ biomass (P<0.01). 3) The content of phosphorus (P) in stem increased significantly with the increase of snow cover (P<0.05). With the increase of snow cover, the content of P in leaves first significantly increases and then decreases, which is presenting as S2 > S1 > CK > S3 > S0. Different organs of plants under different treatments were mainly limited by nitrogen (N) element. 4) Removal of snow cover (S0) reduced stem biomass, plant height, stem height, stem allocation and individual fruit number; the excessive snow cover (S3) reduced plant height, stem height and fruit length; the moderate snow cover (S1 and S2) respectively reduced fruit length and individual leaf numbers. Therefore, different amounts of snow cover did not significantly change the reproductive allocation, but changed the functional traits and nutrient content of different organs.