By comparing distinction of the power system stabilizer model and its operation principle，the problems existing in the current power system stabilizer are put forward.According to the characteristics of multiband power system stabilizer（PSS4B），the coordinate setting method of phase and amplitude is adopt for parameter setting and optimization.The single machine infinite power network model is established based on real time digital system（RTDS），and through test method PSS4B is verified the advantage and effect of power system low frequency oscillation inhibition at low，medium and high frequencies.It also points out the center frequency change on the effect of anti-regulation so as to provide guiding basis of PSS4B parameter setting for engineering site，and laid a good foundation for PSS4B operation in the field.