Abstract: In this paper, the dynamic responses of the transducer to the equal amplitude chirp and envelope modulated chirp pulse excitation are studied. By comparing the main lobe peak values, -3dB bandwidths of the main lobes and the peak side-lobe-levels under the two pulse excitation signals, the performances of SNRs and resolutions corresponding to the two signals are analyzed. The results of theoretical analysis and simulation experiment show that the SNRs and resolutions of the two signals after transducer decreased, but peak side-lobe-levels improved. Compared with the equal amplitude chirp pulse excitation, the SNR and resolution of envelope modulated chirp pulse excitation after transducer is greater, while the corresponding energy loss is higher.