Abstract: We observed the flowering of 18 dominating species selected from controlled and fertilized grasslands in Eastern alpine meadow of Qinghai-Tibet Plateau, and analyzed the response of flowering phenology to fertilization. The result showed: In fertilized habitats, the forbs initial flowering days, peak flowering days and flowering conclusion days were either slightly accelerated or retarded than the flowering phases of the corresponding species in controlled habitats, the flowering duration days were either slightly truncated or prolonged than the duration days of the corresponding species in controlled habitats; the leguminous species initial flowering days were delayed, the peak flowering days and the flowering conclusion days were not different and the flowering duration days were slightly truncated than the phases of the corresponding species in controlled habitats, the fertilization did not significantly change the dicotylous species flowering phases. The gramineous species initial flowering days, peak flowering days and flowering conclusion days were significantly retarded, the flowering duration days were either slightly truncated or prolonged than the corresponding species phenological phases in controlled habitats, the fertilization significantly changed the gramineous species flowering phases. In controlled habitats, the peak flowering distribution patterns were aggregated across species, randomly distributed within families, in fertilized habitats which were aggregated across species, randomly distributed within dicotylous families, aggregated within gramineous family, the fertilization did change the gramineous species flowering distribution pattern as well. This research manifests that the flowering phonological response of alpine community species reacts differently to fertilization.