The use of chemical herbicides is considered the effective methods to control the expansion of Stellera chamaejasme. Limited studies have been conducted on the vegetation and soil ecological stoichiometric characteristics of S. chamaejasme patches after removing S. chamaejasme. Therefore, the ecological stoichiometry of plant and soil C, N, P content and their ratios of different S. chamaejasme patches after removing S. chamaejasme by chemical herbicides were analyzed by selecting the same number of branches of S. chamaejasme using the principles and methods of ecological stoichiometry. In order to provide the reference for ecological restoration and utilization of degraded grassland of S. chamaejasme, we explored the interaction of plant and soil stoichiometric characteristics and nutrient circulation of S. chamaejasme patches. The results showed that the biomass of Gramineae increased after removing S. chamaejasme and the biomass of Leguminosae and Forbs were significantly lower than that within the S. chamaejasme patch (P<0.05). N content of Leguminosae and P content of Forbs were the highest with different patches, and plant C, N content of removing S. chamaejasme were higher than that of other patches. P content of Gramineae was significantly higher outside the S. chamaejasme patch than within the S. chamaejasme patch (P<0.05). The outside and within the S. chamaejasme patch C∶N of Cyperaceae were significantly higher than that of removing S. chamaejasme (P<0.05). The Cyperaceae and Leguminosae C∶P and N∶P of removing S. chamaejasme were significantly higher than that of outside and within the S. chamaejasme patch (P<0.05), forbs of removing S. chamaejasme was significantly higher than that of outside the S. chamaejasme patch (P<0.05), and C∶P of Gramineae of within the S. chamaejasme patch was significantly higher than that of removing S. chamaejasme and outside the S. chamaejasme patch (P<0.05). The C, P content and C∶P of soil in different S. chamaejasme patches were within the S. chamaejasme patch > outside the S. chamaejasme patch > removing S. chamaejasme, and N content, N∶P were removing S. chamaejasme > within the S. chamaejasme patch > outside the S. chamaejasme patch. The soil C∶N of within and outside the S. chamaejasme patch were significantly higher than that of removing S. chamaejasme (P<0.05). The redundancy analysis (RDA) showed that the plant and soil C, C∶N, C∶P, N∶P were significantly positive correlation, while N, P were significantly negatively correlation. After removal S. chamaejasme, the N content, N∶P and P content in plants and soil had a greater effect.