Abstract: The proton irradiation is one of the most important causes of the performance degradation of spacecraft thermal control coatings. The effects of proton irradiation are mainly investigated by using protons of single energy instead of those with continuous energy spectrum in ground testing. In this paper, a method of producing protons with continuous energy spectrum by plasma sheath acceleration in the period of waveform pulse is proposed, which involves the plasma sheath acceleration of bias voltage waveform pulse. The plasma sheath acceleration dynamics is simulated numerically to obtain the protons with continuous energy spectrum under three kinds of triangular bias voltage pulse waveforms by using a particle-in-cell model. The effects of three kinds of triangular bias voltage pulse waveforms on plasma sheath expansion, proton acceleration and energy-dose distribution are discussed. The results show that the space potential distribution has a close relationship with the ion movement, and the ion density is affected by both bias voltage pulse waveforms and ion thermal diffusion. The energy-dose distribution can be adjusted by changing the bias voltage pulse waveforms, which provides a platform for further studies.