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Beet armyworm, Spodoptera exigua (Hubner), is an important pest for many crops. SeMNPV infected development, survival process, and population parameters of S. exigua were studied in present study. The results demonstated that relationship beween probit value of mortality (y) and the logarimic of SeMNPV concentration (x) followed the linear equation: y=0.455+0.9300x. At 27 cels. degree, the LC50 of the third-instar larvae of S. exigua was tested to be 77082 PIBs/ml. Pupa weight (y; mg) of S. exigua decreased significantly with the SeMNPV concentration (x; SeMNPV concentration (PIBs/ml)): y=106.038-1.1962 log(x) (r2=0.915, p=0.044). Fecundity (y; eggs/female) of S. exigua decreased significantly with the SeMNPV concentration: y=690.523-28.5209 log(x) (r2=0.997, p=0.001). Both net reproduction rate (R0) and population trend index (I) decreased with the SeMNPV concentration (x): R0=744.121-54.6707 log(x) (r2=0.983, p=0.009); I=354.259-24.4705log(x) (r2=0.987, p=0.006).