This trial selected two banana varieties: resistant Haigong and sensitive Williams B6 by resistant identify test, and utilized their root exudation to deal with the eggs of south root knot nematode (Meloidogyne incognita) to study the effects of the exudation on the pests’ egg hatch and their larva’s pathogenicity. The results showed as follows: after inoculation, the total hatching rate of south root knot nematode with the processing of Haigong root exudation was 63.26% and the average disease index of Haigong was 22.13, while as for Williams B6, the two indexes were 80.29% and 53.35. Their differences between the two varieties were significantly different.