Abstract: The insecticide resistance of 11 colonies of oriental fruit fly,Bactrocera dorsalis(Hendel),collected from Guangdong,Guangxi,Hainan,Fujian,Yunnan Provinces to three insecticides was measured with the use of film residue method in laboratory.The results obtained from the test with trichlorphon showed that 5 colonies had developed moderate level of resistance with a resistant ratio from 27.42 to 16.42,while 4 colonies developed low level of resistance with a resistant ratio between 8.04 and 4.33,two populations have still susceptible.The resistance to alpharmethrin showed,three populations have already been middle level of resistance with a resistant ratio between 33.82 and 12.19,four populations have low level of resistance with a resistant ratio between 9.27 and 4.14,four populations have still susceptible.The resistance to abamectin showed,six populations have already been middle level of resistance with a resistant ratio between 24.00 and 10.52,four populations have low level of resistance with a resistant ratio between 8.41 and 7.39,only one populations has still susceptible.