Based on target detecting principle of semi-active laser seeker, a new test method is put forward which use windage account model for four quadrant detector of target station and detector signal test error model with the coincidence. It are calculated and well demonstrated for test. Test result indicates that the circuit of windage account for target station is primary when target is located out of tracking region, and the coincidence of windage account for target station is primary when target is located in center of tracking region. Capability of tracking and the value about test of laser seeker in future is analyzed.