Abstract: In the Low-mid frequency band(Typically,several hundred hertz to several kilohertz),the main underwater channel features are important to the active/passive target detection and long-range communication problems,such as the transmission loss,temporal-spatial coherence and nonstationarity.In order to simulate the channel spatial-decorrelation characteristics,a new delay-dependence perturbation method is provided to modify the ideal channel transfer function H(r,ω),which is obtained through the KrakenC acoustic-field calculation model.The numerical simulation results of the macro-parameter channel model conform well to the real shallow water channel measurements with towed electric-discharge sources(Effective bandwidth: 300Hz-2.5kHz) in the senseof statistical characteristics.