The laser detection of underwater acoustic signals exploited a laser receiving technique. It uses light wave in air and uses acoustic wave under water. Because two best channels are combined together, it is an ideal method for remotely detecting underwater acoustic signals. The underwater acoustic signal can cause surface wave motion at waterair interface and modulate the magnitude of the laser beam falling on tile water surface. The modulated underwater laser signal can be detected by using a direct light intensity detecting method. In this paper, the feasibility of the laser detection of underwater acoustic signals is verified experimentally on the basis of theoretical analysis and some problems to be solved are discussed.