This paper investigated the growth characteristics including plant height, leaf length, leaf width, and their incremental pattern of Carex Muliensis, a typical grass in Zoige Plateau wetland under water level gradient of -5.0cm, -3.5cm, 0.0cm, 8.0cm, and 22.0cm. The results showed that the maximum plant height, leaf length, and leaf width of Carex Muliensis were found in the water depth of 8.0cm. The response of plant height to water depth gradient was the most significant, while the response of leaf width to water depth gradient was not obvious. The moderate drought or flooding can promote the growth of Carex Muliensis. In addition, chlorophyll, leaf nitrogen content, and biomass also reached the maximum under 8.0cm water level. Through this experiment, the response of the growth of Carex Muliensis to water depth conditions can be elucidated, which provides data support and practical basis for the protection and restoration of Zoige Wetland.