The aim of this study is to investigate the relationship between the sensory characteristics and protein concentration of enzymatically hydrolyzed isolated soy protein. As a result of QDA, 34 attribute descriptors were developed. According to the results of the flavor profile, the strengths of most color and tastes except sourness were evaluated before activated carbon treatment sample. Principal component analysis (PCA) was performed to summarize the relationship between attributes and samples. The result of PCA was 56.35% (F1) and 35.05% (F2), having explained 94.13% in total variablility. In case of the untreated sample of active carbon, it was located in the first quadrant and correlated with color, flavor, a slightly salty taste, and a slightly bitter taste. It also showed high correlation with meju taste. The activated carbon treatment samples were located in the second quadrant and correlated with delicate taste, slight saltiness, sourness, and umami, having high correlation with burned rice.