Based on coupled simulation of GT-POWER with Matlab and test verification, the dynamic performance of diesel gensets with electronic control pump-pipe-nozzle system were simulated under pulsed load. Then, the influences of PID control parameters on engine's performance under pulsed load were analyzed and a set of ideal PID parameters were obtained. In order to increase the unit's shaft energy before first pulse load and decrease dynamic speed droop, the control strategy of increasing unit's speed before first pulse load is put forward. Simulation results show that the unit's dynamic speed droop decreases from 6.8% in field test to 4.0% in simulation with optimized PID parameters. If the unit's speed is increased before first pulse load, its dynamic speed droop can decrease to 2.8%.