Newly felled logs of rubberwood ( Hevea brasiliensis )are easy to be infected by blue stain fungus( botryodiplodia theobrmae ).Experiment results showed that it was an effective way to prevent the logs from bule stain to spray 2% TMO immediately,an anti mold chemical,on cut end surface after felling,and then brush water repellent 3% TMO coating on the surface,if in rainy season.The anti blue stain effect could sustain for one month.