The experimental population life tables of Snellenius manilae (Ashmead) and Spodoptera exigua（Hübner）were established respectively to evaluate the control potential of this parasitoid on this pest. The results showed that the parameters of S. exigua were as follows: Net reproduction (Population trend index) R0 (I) = 122.0172, Intrinsic rate of increase rm=0.1522, Average generation time T=40.8556d, Finite Rate of Increase λ = 1.1644. The parameters of S. manilae. were as follows: R0(I)= 20.2479，rm=0.3045，T=9.8788d,λ=1.3559. The functional response of S. manilae rearing on S. exigua larvae coincided with the Holling model type-Ⅱ, with the index of a =0.8952, Th =00205, Namax =48.78.The above results indicated that S. manilae had high reproductive speed and strong parasitizing ability on S. exigua. In addition, shorter generation time of S. manilae hinted that it could control S. exigua effectively.