Abstract: After the completion of the Ningxia Sub-project of the National Earthquake Intensity Quick Report and Early Warning Project, the number and distribution of stations in the Ningxia network have changed greatly.Based on the method of background noise level, the seismic monitoring capability of Ningxia network was evaluated and compared before and after the early warning project was completed.The results show that:Considering the positioning of three units, After the early warning project was completed, the average value of earthquake monitoring capacity in Ningxia region was M_L1.1, and the minimum value was M_L0.5.It is 0.5 level higher than before the project was completed.95% of the region's seismic monitoring capabilities have a minimum magnitude M_L1.3.After the completion of the project, the average seismic monitoring capability of Ningxia and its surrounding areas (latitude 34.5°～40.5° N, longitude 103.5°～108.5° E) is M_L1.2, and the minimum value is M_L0.3.It is 0.7 grade higher than before the completion of the project.95% of the region's seismic monitoring capacity has a minimum magnitude of M_L1.6.Considering the positioning of 4, 5 and 6 units:After the early warning project was completed, the average seismic monitoring capacity of Ningxia region was M_L1.2, M_L1.3 and M_L1.4 respectively. It is 0.5 level higher than before the construction of the early warning project.The average seismic monitoring capacity of Ningxia and its surrounding areas reached M_L1.4, M_L1.5 and M_L1.6 respectively, which is 0.6 degree higher than the average monitoring capacity before the completion of the project.The early warning project has greatly improved the earthquake monitoring capability in Ningxia and its surrounding areas.