Abstract: A total of 17 hymenopterous parasites were reared out from the larvae and pupae of agromyzid leaf-miners collected from 13 plant species. All of them parasitized Phytomyza horticola. The field parasitization rate of the leaf-miner was 13.24%, 4.36% and 25.65% for the 1st, 2nd, and 3rd generations of the pest, respectively. Four parasite species, opieus sp., Diglyphus isaea, Chrysocharis pehtheus and c. phryne were found to be dominant among the parasite complex, accounted for 91.9% of the total parasites obtained. Except D. isaea, the other three dominant parasites spent part of their life cycles on alternative hosts. After June of each year, they transferred to leaf-miners oh such plants as Caryopteris incana, Dolichos lablab and Raphanus sativus, and returned to the fields of garden pea, Pisium sativum and rape, Brassica campastris in late autumn.The parasites showed no obvious winter diapause.