Based on the 6 hm² monitoring plot abundance data of Qizimei mountains Nature Reserve, we used the cumulative experience distribution curve (ECDF) to characterize the speciesabundance distribution pattern of different lifeform functional groups in the plot, and six models were used for each function. The species rankabundance curves of different sampling scales were fitted and the fitting effect was tested. The differences between the abundance pattern and model fitting at different scales were analyzed, and the ecological processes andmechanisms behind them. Research indicates: (1) the number of deciduous species is larger than that of evergreen species at various scales, and the species diversity index is greater, but the number of individuals is relatively small. The ranking of rare species in different functional groups is: deciduous species