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This project aims to study soil properties by comparing the physical and chemical characteristics of soil before planting sunn hemp and after incorporating it into the soil. The study was conducted in a rubber plantation in Village 8, Ban Na Subdistrict, Palian District, Trang Province. The findings revealed that the soil quality before planting sunn hemp had an average nitrogen content of 0.27 mg/L, an average phosphorus content of 0.20 mg/L, and an average potassium content of 1.07 mg/L. The average pH was 5.87, the average salinity was 55.40 ppm, and the organic matter content was ≥3.5, which is considered a high level.After sunn hemp reached the flowering stage and was incorporated into the soil over 1–2 months, the soil quality improved compared to soil without sunn hemp cultivation. The nitrogen content ranged from 1.40 to 3.13 mg/L, phosphorus ranged from 1.73 to 3.93 mg/L, and potassium ranged from 5.80 to 12.60 mg/L. The pH level increased to a range of 6.93 to 7.03, salinity ranged from 147.80 to 166.93 ppm, and the organic matter content remained ≥3.5. Further analysis of the soil 1–2 months after incorporation showed even higher soil quality. The nitrogen content ranged from 4.20 to 5.93 mg/L, phosphorus from 4.67 to 6.53 mg/L, and potassium from 15.47 to 18.07 mg/L. The pH level further increased to 7.23–7.28, while salinity ranged from 101.27 to 191.27 ppm. The organic matter content remained consistently ≥3.5, indicating a high level. Before planting sunn hemp, the soil was classified as sandy clay loam with a granular structure. After incorporating sunn hemp for 1–2 months, the soil structure transformed into loam, sandy clay loam, silty loam, sandy loam, and loamy sand. Based on these findings, it can be concluded that incorporating sunn hemp into the soil enhances all measured soil parameters and improves soil structure. This suggests that sunn hemp incorporation is an effective approach for soil improvement to support future agricultural activities.