Based on the S-band dual-polarization radar data of Xiamen City on September 14-15, 2016, the microphysical characteristics of precipitation before and after the landing of Typhoon Moranti in 2016 and their differences were analyzed. Results show that the landing process of typhoon Moranti experienced three stages: slow weakening before landing, rapid weakening after landing, and slow weakening after landing. Before landing, the typhoon had strong convection in the spiral rain belt, the development height was high, the cold cloud process was strong, and there were a large number of ice crystals above the zero degree layer. Below the zero-degree layer, particle fragmentation is severe, and precipitation is dominated by small droplets. During the rapid weakening stage after landing, the development height of the inner area of the typhoon increased due to the influence of the topography. In the fast weakening stage after landing, the development height of the spiral rain band decreases, and the number of ice particles on the zero-degree layer decreases. Below the zero-degree layer, the collision between particles increases and the evaporation process is obvious. The precipitation is dominated by medium and small raindrops, and the warm cloud process dominates.