Abstract: In order to develop the south China special product smaller-galanga and extract the pigment,the methods of extracting smaller-galanga pigment by the zymotechnics-acidity is chosen.Scanning the UV absorption spectroscopy of smaUer-galanga pigment,its maximum absorb wavelength,325 nm is used.Its refractive index is 1.361 and the extraction theory is initially discussed. After having been tested from both the dissolution of pigment,and the effects of light,heat,pH,Na2SO3,H2O2,seven common food additives,Fe3+,Cu2+,Zn2+and Na+ on pigment liquor stability,it shows that smaller-galanga pigment keeps its stability under the conditions:pH2～5,light,Fe3+,Cu2+,Zn2+,Na+,Na2SO3 and seven food additives,but it is faded easily in the effects of H2O2 or heat.However,the smaller galanga-pigment is worth developing.

Key words: Alpinia officinarum Hance, pigment, extraction, physicochemical property, stability, extraction theory