Abstract: The reproduction strategy of Trichogrammatoidea bactrae Nagaraja was analyzed when the host availability suspended. It was showed that T. bactrae could adjust its reproduction strategy when the host was unavailability in a short period (4 days after emergence). Its oviposition was improved on the first day when hosts were availability, while their reproduction potential and female longevity were weakened. However, T. bactrae' s reproduction potential and female longevity were significantly reduced when host was unavailability in a long period (8 days after emergence). Based on such reproduction strategy of Trichogrammatoidea bactrae , it was helpful to take some protection or augmentation measurements to improve its reproduction potential when host was unavailability in field.