Abstract: Tea and some plants that are used as tea are used to drinking for a long time in south china, Usnea fuscorubens Mot.is one of the plants used to drinking. The chemical components of Usnea fuscorubens have different physio-activities and thepigment is one of the components .In this paper,the technology of extracting pigment with boiling water and purifying pigmentwith macroreticular resins and the physical and chemical properties of the pigment from Usnea fuscorubens were studied. Bytesting the spectrum properties of the pigment the effect of pH, temperature ,illumination,different metal ions and food additiveson stability of the pigment were assayed.The results showed that the pigment was red pigment that can melt in water ,differentcauses may make different effete on the pigment stability. As a matural red pigment can be used in food and medicines.

Key words: Usnea fuscorubens Mot, natural pigment, physical and chemiacal properties, macroreticular resins, extracting technology