Development of chocolate products to improve the quality and sensory properties with Saengmaeg-san powder (SP) was attempted. Effects of SP on color, viscosity, total phenol compound content, radical scavening activity and sensory characteristics. In color, lightness value was increased than milk chocolate without SP Also viscosity was significantly higher than chocolate without SP.Total polyphenol content of Saengmaeg-san chocolate was 191.52 mg/1 OOg and Dpph scavenging activity was 87.06%. Results of sensory evaluation, significant different (p < 0.05) were shown in softness, sweet taste, sour taste, bitter taste, texture and overall acceptability depending on the addition of SP.