Dr. Lu Song has developed a flow distribution model of fire extinguishing agent in aircraft engine compartment/APU compartment, a concentration model of fire extinguishing agent in aircraft engine compartment/APU compartment and a smoke detection model in aircraft cargo compartment. The developed model and software platform serve the design and verification of fire protection systems of key models of multi-type aircraft in my country. This research was supported by the National Natural Science Foundation of China Key Project and the Ministry of Industry and Information Technology's Civil Aircraft Special Funding.