Parasitism of seven Trichogramma strains on Asian corn borer（ACB） Eggs were studied under in-door and isolated net condition. The egg masses parasitism rate, the eggs parasitism rate and the number of eggs laidper female were compared. The results showed that parasitic effects of different Trichogramma strains were signifi-cantly different（P＜0.05） on ACB eggs of same basements material. Furthermore, parasitism of same Trichogrammastrain was also different on ACB eggs of two kinds of basements material. Trichogramma laid on ACB eggs masses offresh maize leaves was better than ACB eggs masses of mimeograph paper. Parasitic effects of Trichogramma wasthe best on ACB eggs of maize seedlings under isolated net, the eggs parasitism rate could reach 39.45%~70.48%.Through the test, S-AC strain and M-TC strain of Trichogramma of better parasitic effects have been selected,which could be used to control the 2nd generation of ACB.