Gaussian filter shaping as an important method for processing nuclear pulses is of great significance for the development of nuclear instruments. In this paper

the simulation of the nuclear pulse signal is simulated based on the CR differential circuit on the Multisim platform

and the Gaussian filter shaping simulation of the analog nuclear signal is carried out through the Sallen-Key and multi-level CR-RCmGaussian filter. The simulation results of the stage CR-RCmshow that the S-K method has a fast Gaussian filter shaping stage

the pulse amplitude after shaping increases and the pulse widens. The CR-RCmmethod has a slow Gaussian filter shaping stage

while the CR shaping circuit reduces the pulse width. Based on the principle of complementary advantages

a set of CR-SK hybrid filters is improved and simulated. The simulation results show that the improved CR-SK filter has the advantages of fast shaping series and no widening pulse width after shaping. The energy resolution of the spectrometer has certain guiding significance.