Abstract: To figure out the ecological threshold of the most suitable soil environmental indices for the growth of Suaeda salsa, the changing trends and characteristics of soil physicochemical properties of Suaeda salsa wetland in Liaohe Estuary under different degradation levels were investigated, which would provide theoretical and methodological guidance for the soil habitat protection and vegetation restoration of the Suaeda Salsa wetland in the Liaohe Estuary. Based on the degraded zoning of Suaeda salsa wetland, the Suaeda salsa wetland in Liaohe Estuary wetland was taken as the research object to analyze the changing trends and soil physical and chemical characteristics in various degraded areas and assess the ecological thresholds of main soil indices in the most suitable environment for Suaeda salsa growth by using the Gaussian model. The results showed that with the increasing of the degradation degree, there were general downward trends in soil water content and organic matter content. Gradually, the soil sand content increased, while the clay content gradually decreased, indicating the soil mechanical composition was transformed into coarse particles. Total salt content generally increased. Moreover, the surface cover of vegetation gradually decreased, resulting in the surface soil eroded by wind and river water, and the soil nutrients such as alkaline nitrogen, available phosphorus, and available potassium were also lost. Soil properties gradually tended to deteriorate. In the different degraded areas, the characteristics of soil soluble base cations showed Na⁺ > Ca²⁺ > K⁺ > Mg²⁺, indicating that soil soluble base cations were mainly Na⁺. Soil pH in the study area was between 8.26 and 8.76, presenting alkaline. The optimal ecological threshold of soil total salt content for Suaeda salsa growth calculated by Gaussian model was 11.56 g kg⁻¹ with a rang of 8.734-14.386 g kg⁻¹, and the general ecological threshold range of that was 5.908-17.662 g kg⁻¹. Moreover, the most suitable ecological threshold of soil water content for Suaeda salsa growth was 47.5% with a range of 31.8%-63.2%, and the general ecological threshold range of that was 16.1%-78.9%. Due to the difference in water and salt conditions, there was different suitability for the growth of Suaeda salsa in the different degraded areas. Even so, however, the water and salt control methods by regulating the irrigation water sources and the establishment of good irrigation and drainage system could be adapted to provide theoretical and methodological guidance for the growth of Suaeda salsa.