Abstract： In this work, we consider an SI model for pest management, and concerning about impulsive releasing infective pests and spraying pesticides. We prove that all solutions of (2.2) are uniformly ultimately bounded and there exists globally asymptotic stability periodic solution of pest-extinction when ln1/1-μ1＞rτ-rμθ(1 -exp(-wτ))/Kw(1 - (1 - μ2)exp(-wτ))-βμ3(1 -exp(-3wτ))/ 3w(1-(1-μ2)exp(-wτ))3 is satisfied, and the condition for permanence of system(2.2) is also obtained. It is concluded that the approach of combining impulsive infective releasing with impulsive pesticides spraying provides reliable tactic basis for the practical pest management.