The variation of parameters in power electronic device, such as the change of controller parameters and voltage instability, may influence the dynamic behavior of converter. In the paper, based on the discrete model of SPWM H-bridge converter, the effect of the variation of carrier amplitude modulation coefficient on system dynamic behavior is studied through bifurcation diagram and time-domain waveform. Meanwhile, mathematical analysis of system stability is given, and on this basis, an adaptive carrier amplitude modulation control (CAMC) strategy is proposed, which can adjust carrier amplitude modulation coefficient in real time based on the change of system parameters and ensure the stability of system. Finally, the experimental results using CAMC based on DSP(TMS320F2812) are also provided to verify the effectiveness of this method.