Abstract: Base rot disease of passionfruit is a destructive disease in passionfruit ,The results showed the Pathogen was Fusarium oxysporum Schl.f,sp.passiflorae.The disease develops from Mar.to Dec.in the year.The relationship between the disease development and cultivars, age of tree, pH value of the soil.and support form was also discussed respectively.The experiments showed that Thiophanate methyl 70Wp Could control the disease effectively.