Banana Fusarium wilt,a kind of soilborne vascular disease infected by Fusarium oxysporum f.sp.cubense(E.F.Sm.) Snyd.& Hans.is threatening the banana and Fenjiao production in Guangdong Province,China.Based on the pathogenicity test on 4-5-leaf tissue-cultured banana plantlets and colony morphology on modified Komada medium,the isolates from the regions of Panyu,Zhongshan,Zhaoqing,Zhuhai and Shunde were identified as F.oxysporum f.sp.cubense race 1 and race 4 respectively.It was proved that the pathogenicity test combined with colony morphology on modified Komada medium was a simple,fast and reliable method for identifying races of Fusarium oxysporum f.sp.cubense.