The quasioval iced conductor model was tested in TJ2 wind tunnel to obtain aerodynamic force coefficients by using HighFrequencyForce Balance (HFFB) technique. The calculating theory of galloping characteristics of SDOF is derived, which take account of natural vibration characteristics of transmission line. The effects of wind velocity, sagspanratio, span, conductor diameter on galloping critical wind velocity and amplitude are studied and approximate method to calculate galloping characteristic of quasioval iced conductor are presented at last.