Relying on the 6hm² dynamic monitoring forest stand of research platform in Qizimei Mountains Nature Reserve, based on the sample area and species basic information data, by the method of multiple regression tree and redundancy analysis, we investigated the effect of terrain factors on habitat and species distribution of response to the environment and under different types of association analysis the change rule of species diversity. Researches show that: (1) according to the “1 SE” rules, four split in turn in altitude (1 453 m), slope (23.13°) and altitude (1 398 m), concave and convex degree (4.094) as the cutoff point 150 sample area can be divided into five clusters. (2) The redundancy analysis shows that the interpretation amount of terrain factor to species distribution is 0.077 6, and the interpretation rate is 16.36%. The explanatory power of each environmental factor to species distribution is in order: meanelve > slope > convexity. There was no significant correlation between slope direction and species distribution. (3) Cluster 5 had the highest stand density (527.4 plants/400 m²) and chest height sectional area (3.495 cm²/plant) in the five clusters. Cluster 4 was the lowest standing density (225.4 plants/400 m²) and average chest height sectional area (3.057 cm²/plant). (4) Among the five clusters, the ShannonWinener richness index and Simpson dominance index were highest in cluster 2, and lowest in cluster 5. The scale effect of species diversity was obvious. The highest Pielou evenness index was cluster 4, and the lowest was cluster 5. (5) The Jaccard similarity coefficient between two clusters was lowest in cluster 1cluster 2 (0.331) and highest in cluster 4cluster 5 (0.645). It was concluded that the 6 hm² sample topographic factor in the nature reserve of Qizimei Mountains had a certain effect on the shaping of the habitat in the region, and the “environmental sieve” composed of meanelve, slope and convexity affected the species distribution and diversity pattern in the region.