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The study of soil quality that affects the size of the tuber, tuber weight, starch content, and starch quality of Tacca leontopetaloides, in the Rajamangala Beach, Trang Province, Thailand. divided into 2 areas: the area near the beach (0-50 meters) and the area away from the beach (60-110 meters) with a small canal separating the 2 areas. The study was conducted by randomly collecting soil samples from both areas. Soil quality analysis revealed that The moisture, organic matter and phosphorus values ​​in the soil near the beach were lower than those away from the beach. However, the pH, nitrogen and potassium values ​​in the soil were not different. The soil texture found in the area near the beach was sandy loam soil, while the area away from the beach was clay loam soil. Both areas had brownish-yellow soil, but the area away from the beach was darker. When analyzing the size and weight of Tacca leontopetaloides, it was found that the area near the beach had larger and heavier starch than the area away from the beach. The amount of starch in the area near the beach was 150.15 grams per 5 kilograms of starch weight. The starch quality analysis It was found that the starch quality of both areas was not different. Therefore, it can be concluded that the different soil quality affects the size, weight of the tubers and the amount of starch from the tubers. The sandy loam soil is the most suitable soil for growing the tubers because it gives higher yields in the form of tubers and starch than other soil types.