The mixture formulation of chlorothalonil emulsion （F1） and mixture of chlorothalonil emulsion and other fungicide （F2） was more effective than F2 or sodium pentachlorophenol （NaPCP） alone in controlling stain and mold of rubberwood （ Hevea brasiliensis ）. In pilot test, the sawntimber treated with each formulation of F1/F2 and NaPCP was not infected with stain and mold. In vacuum pressure treatment test, the result indicated that F2 could prevent the treated timber for 12 days from stain and mold except white mold; and the mixture of 0.0094% F1 and 0.018% F2 could keep the treated timber for 15 days from stain and mold in air drying procedure under the above concentrations. The higher concentrations of F1/F2 might prevent the treated timber for longer time from stain and mold.