Wetland ecology monitoring is an essential technical guarantee for the protection and restoration of the fragile ecosystem of wetlands. Due to the degradation of keystone species Suaeda HeteropteraPall. (S. Heteroptera) in the Liao River Estuary wetland, the Wetland Image Monitoring System (WIMS) was established to obtain real-time, continuous, high spatiotemporal resolution data about the coverage and height of S. Heteroptera. Based on the monitoring data, we elicited the best model to describe the variation of the coverage and height for S. Heteroptera. The results showed that the growth of S. Heteroptera could be divided into three stages: rapid growth stage (April-May), slow growth stage (June-August), and stable stage (after September). The Bertalanffy model was the best choice for the coverage simulation of S. Heteroptera. The segment model composed of the linear and Gompertz models was suitable for the height simulation of S. Heteroptera, which could effectively reduce the relative error compared with the single model. In addition, the WIMS could potentially capture other important ecological factors in local regions, including benthic animals, birds, waterlogging conditions, etc. Although WIMS has some application limitations, the high spatiotemporal resolution and relatively low cost make it an effective tool to explore the degradation of typical ecosystems under climate change and human activities.