Battlefield emergency communication system is an important method to ensure smooth command and information. According to the current situation of the extensive application of laser countermeasures such as laser jamming and warning in modern war, the pulse interval modulation and demodulation technology is adopted, such as multiplexing the laser jamming into communication laser and multiplexing the laser warning system into a receiver. The battlefield emergency communication capabilities of the system are expanded on the basis of maintaining the original function of the laser countermeasure system, the anti-jamming ability of the current emergency communication system is improved. And the effectiveness of the method is showed through simulation and experiments.