In order to construct the complex battlefield electromagnetic environment accurately, scientifically and realistically, a new idea of constructing the complex electromagnetic environment based on the combination of tactical simulation and signal simulation is proposed. Based on the hardware-in-the-loop simulation technology, using the computer parallel processing algorithm, the remote director and control module completes the planning and design of tactical simulation, and uses the reliable communication protocol to complete the real-time information interaction with the battlefield electromagnetic signal generator, so as to realize the realistic simulation and online injection of complex electromagnetic environment signals. The simulation results show that the system can simulate the radar emitter signals of various new systems with high stability and high fidelity. The system is powerful and easy to operate, and has important military application value.