Abstract: 【OBJECTIVE】Tried to find each factor which may have separate effect on keeping stability of Viburum dilatatum Thunb red pigment；【METHOD】Separate pigment effected by different method was determined by ultraviolet spectral photometer at 535 nm.;【RESULTS】This pigment is water soluble pigment which was stable below 75℃ and under pH﹤4, and was low sensitive to light flight condition, but the stability changed worse under cast light and reduction media. Fe3+ could alter the color of red pigment solution, caused precipitation and decreased its stability, but K+, Mg2+, Zn2+, Al3+, gluscose and sodium benzoate had little effect on the stability. benzoic acid sodium have certain effect to this pigment, but Carbohydrate碳水化合物 and Gallic acid 没食子酸 has little effect to this red pigment.【CONCLUSION】The stability of Viburum dilatatum Thunb red pigment changed worse under cast light and reduction media..