The changing climate has increased the frequency of hazardous weather events, which has placed higher demands on monitoring hazardous weather. In addition to the conventional S-band and C-band operational radar networks, in recent years, many cities in China have built X-band weather radar monitoring networks to improve the spatiotemporal resolution of hazardous weather monitoring and the low-level observation information of weather systems. Hybrid-tilt reflectivity is extracted from the multi-tilt radar measurements over the radar domain, which is closest to the surface and not affected by orographic blockage. It is important for monitoring the occurrence and development of convective systems. In order to take advantages of the wide detection range of S-band or C-band weather radars and the high spatiotemporal resolution of X-band weather radars, this study presents a method of mosaicking hybrid-tilt radar reflectivities derived from the measurements of S-band or C-band and X-band weather radars. This method includes 1) generation of hybrid-tilt reflectivity, 2) conversion of radar reflectivity in different frequencies, and 3) mosaicking of reflectivity measurements from multiple radars. Based on this method, the hybrid-tilt reflectivity mosaic products of Shenzhen and Xi’an are generated, with the spatial resolution of 30 m and the temporal resolution of 1 min. During the events of different precipitation types, the hybrid-tilt reflectivity mosaic products are evaluated using the reflectivity measurements from the Dual-frequency Precipitation Radar onboard the Global Precipitation Measurement Core Observatory (GPM-DPR). The result shows that the hybrid-tilt reflectivity mosaic products are highly consistent with the GPM-DPR reflectivity measurements, and the mean errors are within ±1dB.