Abstract: Aleiodes dendrolini (Matsumura) is an important braconid parasite of pine caterpillars (Dendrolimus spp.) in China. This paper reports the results of cold storage study in 1987~1989. The experimental materials were collected from Fengning, Xinglong Counties, Hebei Province, and Ningcheng County, Nei Mongol Autonomous Region from early March to 20th April. Some of the hosts parasitized by Aleiodes were placed in a refrigerator at 5±1℃: and the others in the laboratory under room temperature. The resultes are as follows: (1) There was no difference in the emergence rate and life-span of adult between Aleiodes dendrolimi which have been cold stored for 4~5 months and those of the checks (untreated). (2) The emergence periods of adults were influenced by the duration of cold storage. The longer the duration of cold storage, the earlier the beginning date of emergence and the shorter the duration of emergence. (3) Adults of Aleiodes would mate and oviposit normally after cold storage.(4) All of the hyperparasites were killed after cold storage for 4~5 months. When Aleiodes were immigrated from one location to other, cold storage method can be used for safety and effectiveness purposes.