In order to study the interaction between igniting pyrotechnics and packaging cellulose materials during the working process of traditional igniters for rocket engines and the influence of the structure of igniting pyrotechnics on flame propagation characteristics， igniting pyrotechnics/cellulose composite samples were prepared. The effects of cellulose shell on the thermal reaction performance of igniting pyrotechnics were studied by simultaneous thermal analysis （DSC-TG） and Fourier transform infrared spectroscopy （FTIR）. On this basis， the influence of charge structure， charge amount and formula composition on flame propagation process and combustion temperature distribution was studied by using simulated combustion chamber. The flame structure and flame temperature distribution of different igniters were obtained by high-speed camera and high-speed infrared thermal imager， and correlated with the collected pressure data. The results show that the cellulose shell reduces the total heat release of the condensed phase reaction of the black powder and the Mg/PTFE ignition powder. When the cellulose content is 33.33%， the total heat release of the two igniting pyrotechnics is reduced by 66.36% and 29.98%， respectively. However， the heat release of B/KNO₃ increased by 2.39 times. The analysis of gas phase decomposition products and combustion condensed phase products showed that cellulose did not change the thermal reaction path of black powder and Mg/PTFE. The simulation of ignition process shows that the pre-ignition phenomenon will occur in the ignition and combustion process of the black powder igniter with a cylindrical charge of 10 g. The igniting pyrotechnics generates a large amount of gas to carry some unburned particles to break the shell before ignition. The cellulose shell has a certain pressurization effect， which lays a pressure foundation for the establishment of the initial flame. The charge structure and charge quantity have no significant effect on the combustion temperature of the igniter， and the difference of the combustion temperature does not exceed 50 ℃. However， the working time of the igniter of the square and annular igniter cartridges is shorter， which is about 42.4% shorter than that of the small cylindrical and shaped igniter cartridges， which is beneficial to improve the ignition efficiency. In terms of formula influence， Mg/PTFE has the highest combustion temperature and the shortest working time， while the combustion temperature of large particle size black powder is higher than that of small particle size， so the former works longer.