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Soil Quality Comparison Study The areas where brazil nuts grow with different densities and different structural of Brazil nuts in each area. The objective is to study the relationship of Areas where brazil nuts grow at with different densities In the field of Ban Thung Na School, Nam Phut Sub district, Mueang Trang District, Trang Province. This case study about the soil pH, temperature, soil structure, soil retention, soil texture and macronutrients that are indicators of soil quality. In each area, the results of the study of the structural of brazil nuts growing, including leaves, stems and flowers, were found in high density growing (A), with a pH of 6.93 at a depth of 5 cm, with an average temperature of 30°c at a depth of 15 cm. The average temperature is 28°c. The soil structure was granular. Soil adhesion is friable. Soil texture was loam type, leaf size on average 71.7 mm, stem size on average 507.3 mm, average number of flowers 13 flowers. There was a difference in medium density growth of Brazil nuts (B) with a pH of 7.16 at a depth of 5 cm, an average temperature of 33°c at a depth of 15 cm, an average temperature of 30°c. The soil structure was granular. Soil adhesion was friable. The soil texture was sandy clay loam, the average leaf size was 37.5 mm, the average stem size was 418.3 mm, the average number of flowers was 8, and the area with low density of Brazil nuts (C) with a pH of 7.21. at a depth of 5 cm, average temperature 35°c at a depth of 15 cm with an average temperature of 32°c , soil structure is granular. Soil adhesion was friable. Soil texture was sandy loam type, average leaf size 28.6 millimeters, average stem size 297.6 mm. Average number of flowers 6 flowers. Keywords: Brazil nut, ground plant, soil quality.