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The purpose of this project was to study the soil quality that affects the size of the tuber and the soil quality that affects the cyanide content in the Tacca leontopetaloides. Soil samples and tuber were collected from 2 areas: the area away from the beach and the area near to the beach. To analyze soil properties, including pH, Nitrogen value, phosphorus value, Potassium value, humidity, organic matter, soil texture and soil color, as well as analysis of cyanide content in tuber and flour obtained from processing. Soil samples were collected by digging the soil at a depth of 10 centimeters from the soil surface, randomly collecting 600 grams of soil samples of each sample, and randomly collecting samples of about 5 kilograms of tuber that the area near to the beach had sandy loam with brown and yellow soil, and the area away from the beach had a sticky loam with brown and yellow soil. The soil quality of the two regions did not differ statistically significantly in pH and nutrients, but they differed in soil moisture and organic matter content. The soil near to the beach area has less organic matter and moisture than the area away from the beach. Meanwhile, the results of the analysis of cyanide content in Tacca leontopetaloides and in Tacca leontopetaloides's flour were not different. No cyanide accumulation was detected in the two areas. The results of the study show that soil quality affects the size and weight of the plantain. Sandy loam soil is the right soil for planting Polynesian arrowroot. The information obtained can be used to increase the efficiency of cultivation and strengthen the safety of consumption of tuber products. Keywords: Tacca leontopetaloides, Cyanide, Soil Quality