The Poisson Point Process (PPP) is widely used in wireless network modeling and analysis due to its theoretical analytic and random nature. However, the actual base station deployment is not completely random. In view of the mutual exclusion of base stations, we propose the Poisson Hard-Core Process (PHCP) to model the Homogeneous Cellular Network (HCN). We first choose a base station access scheme based on the Maximum Signal to Interference Ratio (SIR) criterion. Then per tier approximate SIR analysis based on PPP method is used to derive the approximate coverage of PHCP heterogeneous network. The simulation results show that the approximate coverage generated by this method is the lower bound of the actual coverage, and the coverage of the PHCP network is better than the PPP coverage, which is more suitable for the actual base station deployment with mutual exclusion.