Abstract: In order to remotely control long–distance underwater acoustic communication and to effectively extend action range, this paper proposes a method of using air-gun as a sound source for underwater acoustic remote control. Taking commercial air-gun as an example, the feasibility of the air-gun used for remote underwater acoustic communication is analyzed from three aspects: sound source level, frequency and consistency. High source level and low frequency ensure that sound pulse emitted by air-gun can be spread over a long range underwater and high consistency ensures that the sound pulse could be coded and detected accurately. According to the need for transmission of the instruction level remote information, the time-delay pulse coding method and signal detection method are proposed. The simulation is carried out in different hydrological conditions, and shows that the proposed methods are an achievable approach to remotely controlled underwater acoustic antagonistic equipment such as acoustic decoy, to provide reliable communication for long distance underwater operation from mother ship and to support cooperative work of far multi-nodes.