In the process of projectile penetration, the high-g accelerometer in the penetration ammunition receives valid signal, it also receives a lot of interference signals, interference signal affects accurate control of burst point. For the bimodal interference in the penetration process, a method was proposed for eliminating bimodal interference by timer delay control principle and simulation. In order to guarantee accurately burst point, verified by simulation, the system is better for anti-jamming and layer-identify.