摘要: Using natural cosmic ray muon as radiation source, muon absorption radiography can realize nondestructive detection of large-scale geological objects. Simulation analysis is an important step in the application of muon absorption radiography. Currently, most of the radiography simulations are carried out by simulating the muon transportation in the object to be measured using the MonteCarlo method. However, using MonteCarlo method usually takes a long time. It is not suitable for some scenes that need to get simulation results quickly. Based on the energy loss of muon in the object to be measured, the fast simulation of muon absorption radiography was realized, which makes up for the deficiency that MonteCarlo simulation takes too much time. Specifically, according to the known structure of the object, the muon flux distribution was obtained through energy loss and flux calculation, and then the radiography results were obtained. Taking Khufu pyramid as an example, the results of fast simulation and MonteCarlo simulation were compared in this paper. The preliminary results show that the imaging results of the internal structure of Khufu pyramid obtained by fast simulation are similar to the MonteCarlo simulation, and the average relative difference between the flux obtained by fast simulation and MonteCarlo simulation is less than 5%. It takes only about 1/240 of the time of MonteCarlo simulation.