| In this paper, the feeding and oviposition characteristic of Liriomyza huidorbrensis(Blanchard) were observed. Using the number of feeding punctures and eggs as the selectivity indicator,the feeding and oviposition selection of Liriomyza huidorbrensis to host plants were studied in the laboratory. And the difference of the selective the host plants in choice and non-choice circumstance was found.We studied the relationship between host plant and the population dynamies of the Liriomyza huidorbrensis in the laboratory and constructed the fertility table in different host plant. The intrinsic rate of increase ,finite rate of increase ,next reproductive rate,mean generation time and population doubling time were calculated for the population in different host plant. At Phaseolus vulgaris L Liriomyza huidorbrensis population had the highest rm, λ , R0 and shortest t .The theoretics stable age distributions revealed that very high proportion of the immature stage (above 95%) was presented in the laboratory populations as compared with the adult stage(less5%) at all the host plant tested.Toxicity measurement indicated that host plants significantly affected susceptibility of the larvae of Liriomyza huidorbrensis. The order of susceptibility of the 2nd instar feeding on different host plants was Brassica campestris L.ssp.pekinensis Rupr > Lycopersicom esculentun Mill> Lycopersicom esculentun Mill> Latuca sativa L.var.angustata Irish> Phaseolus vulgaris L.. The LC50 of avermectin on Phaseolus vulgaris L. was 3 folds higher than those feeding on Brassica campestris L.ssp.pekinensis Rupr.Susceptibility of the 2nd instar larvae to avermectin , chlorfenapyr, cypermethrin, fenvalcrate, bisultap and spinosad was tested respectively. The results showed that the orders of LC50 were cypermethrin > fenvalerate > bisultap > chlorfenapyr> avermectin > spinosad. The toxicity order of 72h to adult was cypermethrin< fenvalerate< bisultap< avermectin < chlorfenapyr < spinosad.
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