Abstract: The purpose of this article was to improve the solubility of dietary fiber in garlic skin and assess its anti-oxidant activity. The enzyme-gravimetric method was used to detect the content of dietary fiber in garlic skin for the first time. The technological conditions of enzymic modification of IDF and the capability of antioxidant of soluble dietary fiber in garlic skin were studied in this experiment. Results showed that TDF was of69.18%, IDF of 61.9% and SDF of 7.28%. By single-factor experiment and orthogonal experiment, the optimal technological conditions was founded as follows:cellulase enzyme dosage 5%, enzymolysis time 4h, enzymolysis temperature 45℃, pH6.5, material-liquid ratio 1∶15g/mL, and the dissolved quantity of soluble dietary fiber (SDF) was 33.20 g per 100 g. It had been concluded that cellulase enzyme could remarkly raise the solubility of dietary fiber from garlic skin and soluble dietary fiber of the garlic peel had a high ·OH and DPPH· radical scavenging activity.