Simulation has become an important means to evaluating the feasibility and value of programs made by emergency command and rescue department. At present, there has no detailed study for the simulation exercise programs deduction system. This paper focuses on the program reasoning process in the emergency simulation exercise program, and designed a program based on Delta3D simulation engine deduction system. This paper also discussed the system architecture, the logical structure of the key modules and key technologies in detail. Using this system can be extended and build a variety deduction system of simulation exercises, effectively improve the ability of quantitative analysis for the program and rescue efficiency of the commanding officers and rescue personnel.