In order to verify the effects of soil physi-chemical factors on the banana fusarium wilt pathogen (Fusarium oxysporum f. sp. cubense race 4,Foc 4),various soil physi-chemical factors including soil types,temperature,water content and pH value were simulated under laboratory conditions,and the effects on the growth and infection of Foc 4 were observed and analyzed.The results showed that the optimal growth conditions for Foc 4 were at 25℃ with higher soil moisture of 30% and acidic pH value of 4 to 5 in soil; whereas the optimal infection conditions of Foc 4 to banana plantlets were at 30℃ and in the acidic soil environment (pH 3 to 5) in the pot experiments.