The construction of the Qinghai-Tibet Railway is a centennial project of the People's Republic of China. A large part of this railway is located on alpine meadows (typical vulnerable ecotones characterized by high altitude, low temperatures, and scarce annual precipitation) between the Tanggula Mountains Pass and Damxung County. Because the construction of this railway is inevitably a source of disturbance to the surrounding environment, it is vital to study the revegetation of these severely affected alpine meadows. To understand the community dynamics of the affected alpine meadows, we investigated the vegetation present on the impacted land during the railway construction period (2005), as well as 4 years (2009), and 8 years (2013) after the construction period. Eight 10 m×40 m plots uniformly located between the Tanggula Mountains Pass (91° 43' 31.4" E, 33° 04' 36.3" N) and Wumatang (91° 32' 11.95" E, 30° 37' 51.05" N) were sampled, each with 9 quadrants 1 m×1 m in size. The data collected included species composition, species coverage, species height, and the population size of each species. To this end, a series of variance ratio (VR) tests, χ² tests, and Spearman's rank correlation coefficient tests were conducted. The results show that the community coverages were (35.21±4.41)%, (33.42±3.01)%, and (43.41±3.26)%, and 71, 78, and 85 species recorded in the year 2005, 2009, and 2013, respectively. After dropping the species with importance values lower than 0.01, we used the 23, 27, and 21 dominant species in our subsequent analyses for the respective periods. Overall, species richness and community coverage increased over time, with the overall interspecific association indices (VR) being larger than 1 (from 2005 to 2013). In addition, the results of the W statistics (χ_0.95N² < W < χ_0.05N²) showed that the overall associations between species in the community were all significantly positive (P<0.05). The sequential order of association was VR₂₀₀₅ > VR₂₀₀₉> VR₂₀₁₃, suggesting that the intensity of the community associations gradually declined over time. Finally, the proportion of positive and negative interspecific associations between the dominated species pairs declined, and the proportion of species pairs achieving significant and highly significant levels tended to increase during the 8 years of revegetation. In addition, the associations between the same species pairs varied significantly among years of investigations(e.g., the association between Potentilla bifurca and Anemone imbricate was not significant during the railway construction period, but was significant in 2009 (P<0.05) and highly significant (P<0.01) in 2013). Lastly, the number of mesophyte and hygrophyte species such as Taraxacum leucanthum and Saxifraga tibetica declined, while that of drought-tolerant plants such as Ceratoides compacta increased. Overall, the results indicated that the alpine meadows affected by the Qinghai-Tibet Railway construction project fluctuated greatly during the first 8 years of revegetation. Future research can be done to more precisely determine the patterns present during the time in which the alpine meadow community becomes stabilized.