Reproduction characters of Trichogramma dendrolimi and T.chilonis were compared from four aspects,including adult mortality rate,the number of egg-laying,complementary nutrients and age.Ovipositor structure was researched in the same time.The results showed that the reproduction characters of T.dendrolimi were different from T.chilonis.The ovipositor length of T.chilonis（228±21.07μm） was significantly higher than T.chilonis（168±35.17μm）.