Based on the internal ballistics theory, the chamber pressure and the motion of the load after the ignition device being triggered is analyzed, and the detailed calculations and analysis are carried out. Using two typical structures as carriers, different forms of loads is loaded into the cavity, the ignition device with different charges is chosen as the initiating components for firing, the different output characteristics is formed, and the pressure exerted by the ignition device on the load and the variation law of the load motion velocity with time are calculated. Results show that as the amount of charges increases, the maximum pressure within barrel and the motion velocity of the load increase. The output characteristics can be controlled by loading different qualities of black powder and adjusting the formulation, and the launching initial velocity of the load is adjusted, thereby controlling the output characteristics of the ignition device is realized, which provide references for the practical application of ignition devices.