Abstract: The array signal simulator is a useful signal generator which can simulates received signal. The sonar simulator in this paper simulates the towed ship radiated noise in time domain and the space propagation characteristics, the target signal and the sea noise. Referring to the simulation of the towed ship noise, ECS model is used to set the power spectrum shape of wideband signal, AR model is used to simulate the power spectrum, and the image mirror of the first reflection from the sea surface and bottom is computed to simulate the multipath channel. The simulator uses the interpolation filter to simulate the precise time delay of wideband signal between the array elements.