In doing a special project to study the concentration of coconut water is used to produce this nata de coco. The purpose is to isolate purify microorganism, study on growing characteristics of purify microorganism is used in the production of nata de coco in the locality and a comparative study of coconut water to water ratio that has resulted in the production of nata de coco that ratio of adding coconut water per water level difference 4 formula. Including formula 1 (control), ratio of adding coconut water per water percent 100: 0. Formula 2, ratio of adding coconut water per water percent 70:30. Formula 3, ratio of adding coconut water per water percent 50:50. And formula 4, ratio of adding coconut water per water percent 30:70.