Abstract: To overcome the shortcomings of traditional communication systems which were easily disturbed and weakly encrypted，a laser communication system which could transfer audio and data simultaneously was designed. The audio was compressed to 4 800 bit/s data rate without distortion by using the advanced multi-band excitation (AMBE) algorithm, then the coding data stream of audio and data drove the laser to emit. Audio and data were recovered after electro-optical conversion and decoding at the receiver. The communication experiment with the distance of 2.5km proves that the system features long distance, clear audio and stable data, it can be applied in air-to-air, air-to-ground, ground-to-air and ground -to-ground communications.