Abstract: Abstract: Based on technologies such as human?machine interaction, virtual-real integration, precise fire extinguishing agent spray trajectory, and fire attenuation model, a multi?functional fire water gun virtual-real integration system is developed and designed, which can achieve simulation training of multi?functional fire water guns in different typical complex chain fire scenarios. Through experimental verification, the system can achieve accurate reproduction with an error of less than 2% for key parameters such as the height, distance and angle of the spray mode of fire extinguishing agents. It can also be closely related to the feedback of actual fire extinguishing effects, effectively improve firefighters' practical handling skills in typical complex fire scenarios.

Key words: multi?functional fire water gun, combination of virtual and real, simulation training, trajectory algorithm, facticity