Abstract: Sensitivity of Bradysia odoriphaga in various places in Hebei province to some insecticides was determined. The insects in Suning had about 615 times tolerance to chlorpyrifos and phoxim compared with that in Yongnian, Dingzhou and Baoding. But no significant differences of sensitivity to imidacloprid were found among these places. Also, no significant differences of sensitivity to all the 3 insecticides (imidacloprid, chlorpyrifos and phoxim) were found between the insects fed on leek and garlic.