The effects of iodopropargyl carbamate（IPBC）and decyldimethyloctylammonium chloride（DDAC）used for rubberwood protection from mould and blue stain were studied.The results of laboratory tests showed that rubberwood samples treated with IPBC or IPBC+DDAC compound,respectively,had good resistance to mould and blue stain fungi,but IPBC+ DDAC compound was more effective than IPBC alone.In the first two months of field tests,the percentage of infestation area on rubberwood specimen surfaces was less than 10% when treated with 0.2%solution under a vacuum pressure process,or 0.3% solution using an immersion treatment.All the samples tested could reach the requirements for rubberwood storage and sawing process before drying.