Abstract: It analyzes the prestress concrete bridge duct friction resistance test principle.Aiming at prestress concrete continuous box girder of Longyuwan Road cross-western ring Road high-speed train flyover in Hainan Province, it makes the friction resistance detection of selecting 2m small girder bunch,25m middle girder N1 bunch(5),30m N3 bunch(4), boundary girder N1 bunch(6).The results show that with the present construction level, the real tested values of duct friction resistance coefficient μ and deviation factor k are different from the designed ones,that is prestress loss of prestress reinforcement is different from designed one.So, it should adjust the tension controlling force of construction.