Abstract: Using Trichogramma for post control in a great agricultural and forestt area has been developed. However, rearing with natural host eggs can't meet the need for the great area, and therefore we started the investigation work for artificial mimicking egg of Trichogramma host. In 1977, we successfully used artificial nutrient medium to grow Trichogramma for three generations. Artificial egg was then in 1978 successfully made outt of artificial shell containing nutrient medium. Trichogramma dondrolimi laid eggs in the artificial host eggs and the eggs laid developed into adult which can get out of the artifical shell. The artificial nutrient medium consists of yolk, milk. Neisenheimer's salt, 30% hemolymph-plasma of Antheraea pernyi pupa. In the first half of 1979, some ervstal amino acids were added into the nutrient medium and the amount of homolymph-plasma of Antheraea pernyi pupa dccreased to 9.8%. In this medium the egg of Trichogramma can develop to adult, and some adults can occasionally unfold wings. The proportion of amino acids and pretein contents in nutrient medium, the physical properties of artificial medium and the hormone secretion and nutrition of insect with relation to environmental conditions will need further investigation.