The electromagnetic scattering analysis of conductor targets with Combined Field Integral Equation(CFIE) is accelerated by exploiting the Graphics Processing Unit(GPU). Compared with the Electric Field Integral Equation(EFIE) and Magnetic Field Integral Equation(MFIE), the CFIE could eliminate interior resonance problems, and has better condition number. The numerical technique is the Method of Moment(MoM) that based on RWG basis functions. And all the procedures are completed by the GPU, including impedance matrix filling, voltage vector filling, matrix equation solving with Conjugate Gradient(CG) algorithm, and the Radar Cross Section(RCS) calculation. More than ten times of speedups are achieved under the precondition to ensure the numerical accuracy.