Abstract: This study provides an overview of the seismic geological characteristics of the M_S5.5 earthquake in Pingyuan, Shandong. In this study, the rapid response and disposal capabilities after the earthquake, including mobile gravity and geomagnetic emergency observations, were elaborated, and encrypted observations after the earthquake were conducted. It analyzes the changes in gravity and magnetic data before and after the earthquake. The primary use of mobile gravity data in recent years has been to systematically analyze the dynamic evolution characteristics of the half-year scale difference change and the 1～3 year scale cumulative change in the gravity field before the M_S5.5 earthquake in Pingyuan. It better reflects the abnormal precursor information of the rapid increase in mobile gravity during the development and occurrence of the M_S5.5 earthquake in Pingyuan and the effective theory of reverse recovery of the gravity field after the earthquake. Finally, the emergency observation results of mobile gravity and magnetism were analyzed, and the relationship between the gravitational field, stress field, and earthquakes was discussed. Through post-earthquake emergency observation and analysis, we should continue to strengthen the capability of gravity and magnetic fusion analysis, improve the reliability of the analysis results, provide a feasible basis for subsequent observation and further analysis and judgment after the earthquake, provide a reference basis for post-earthquake summaries, and strengthen mobile monitoring and earthquake risk zone identification in the Shandong region.