Grazing and mowing were the most common utilization types in the Inner Mongolia steppe, and they had been proved to play different roles on the plant-plant interactions and community succession. In the present study, There was a 3-years of continuous monitoring experiment on the typical steppe community. We compared the two different indices of community small scale patterns with 2 algorithms by the Ecosim 7.72 software. The results were shown as follows: (1) For 3 consecutive years, the plant species interactions in community-level under grazing were competitive,especially in 2014, the results didn't support the stress gradient hypothesis. (2) In 2013 and 2015, the species interactions of community under mowing were competitive, but in 2014, on account of the drought and elevated air temperature, they were facilitative. (3) Different grassland utilization types had distinct effects on plant species interactions, and the effect were also regulated by monthly precipitation and monthly average air temperature in growing season. The present results provided the improvement of stress gradient hypothesis and the theoretical foundation in rational utilization of grassland and the recovery of degraded grassland.