Use Unity3D virtual reality to develop engine, and establish virtual reality scene simulation system of artillery exterior trajectory. According to the artillery shooting process characteristics, confirm the system general requirements and the development process. Adopt UG + 3ds Max joint modeling method to establish the ballistic and artillery model. Analyze artillery particle exterior trajectory equation set, combine the Unity 3D API C# script editing system, particle system, audio system and NGUI the third-party plug-in to realize the scene simulation design of artillery shooting process. Then compare the example with the trajectory table data. The result shows the system could express the simulation of artillery shooting process and flight regime, provide reference for the researchers of weapon and ammunition.