Abstract: Atmospheric ice nuclei play a crucial role in the occurrence and development of convective cloud precipitation. This paper is based on collaborative observations of ice nucleation and aerosols in North China and proposes a parameterized ice nucleation formula that reflects North China’s actual characteristics. The parameterization description of ice nucleation in the spectral bin microphysics (SBM) scheme of the Weather Research and Forecasting (WRF) model is improved and then used to simulate typical convective cloud precipitation processes in North China. The results indicate that, as compared to the unmodified scheme, the modified scheme produces convective clouds characterized by enhanced updrafts, strong radar echoes, and high rainfall intensity, in good agreement with observations. Under updrafts, atmospheric ice nuclei are transported to the middle and upper layers of clouds and cloud anvils, increasing the number of ice crystals in the upper atmosphere through processes such as heterogeneous nucleation. In addition, the three heterogeneous ice-formation mechanisms of atmospheric ice nuclei, namely, contact freezing, condensation or sublimation freezing, and immersion freezing, occur in different temperature ranges and dominate at different heights. When the concentration of atmospheric ice nuclei increases, the formation rates of the three heterogeneous nuclei increase synchronously and are more competitive than in the case of the homogeneous freezing of cloud droplets. High concentrations of atmospheric ice nuclei lead to increased heterogeneous nucleation and mass concentration of ice crystals and snow. Furthermore, the consumption of cloud water by heterogeneous nucleation reduces graupel and rainwater.