Earthquake emergency rapid assessment product is an important support for post-earthquake emergency command work, and the accurate and reliable rapid assessment impact field is the foundation of emergency products. To evaluate the application effect of post-earthquake rapid assessment impact field, this paper took 94 destructive earthquakes from 2001 to 2024 as the research objects, and studied the deviations and causes between the surveyed intensity circles and the assessed impact fields in three aspects: epicenter location, long-axis direction, and attenuation relationship. The results showed that:(1) The deviation between the macro epicenter and micro epicenter was mostly within 5 km, but factors such as the superposition of earthquake damage, house distribution, co-seismic geological disasters, and surface rupture would expand the deviation;(2) The use of fault information to assess the long axis direction could meet the application needs for most earthquakes, while factors such as the absence or misjudgment of the seismiotectonics the inconsistency between residential areas and the fault direction would increase the deviation;(3) The attenuation model could reflect the intensity attenuation process of the long and short axis directions of most earthquakes, but the surveyed intensity circles were affected by terrain and the distribution of residential areas; such models were not applicable to earthquake events that cause large-scale co-seismic surface rupture.