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Publisher Summary This chapter determines a probability of post-earthquake fire's occurrence (PPFO), for which a method of discrete event system simulation (EEDC) is developed. A post-earthquake fire is usually induced by strong earthquake. It has been a highlight of earthquake engineering because of its serious results and high frequency, and is also the key factor in the earthquake disaster control processes. ’The probability density function of time for each stage of fire rescue is also put forward. An example in the chapter shows the advantages and realism of the suggested method. The factors that may have some influence on PPFO are population density, earthquake intensity, and characteristics of soil. Because of the mutual action of all factors, there is a weak linkage between the occurrence of fire and the density of population. According to the statistical analysis of a number of post-earthquake fires, PPFO has almost the same characteristics as normal fires. The appended feature is that PPFO has a direct relation to the total size of damage, which is called the “effective area of fire source” (EAFS). In order to show the advantages and practical characteristics of the suggested method, a city is chosen from Henan province, whose simulation analysis results generally represent the characteristics of this method. The system simulation method uses an active mathematical model instead of a real system to do experiments for the system's analyzing, designing and decision-making.