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The highlight structure model of underwater target echo and the model of underwater target dimension recognition based on cross-spectrum method of splitting beam are given. The generating methods of reflecting and scattering highlights digital time series are presented. We introduce a method to simulate the target dimension characteristic with a circular arc array placed in an anechoic pool. Each projector of the arc array transmits acoustic highlight simulating signals in synchronous or asynchronous mode. The transmitted signals arc transformed into element space by the time-varied matrixes, which are, used Io project the highlights on the arc array. The method is applied in the homing system simulation. The simulation results show that the methods can get better simulation effect of an underwater target dimension. The methods not only can simulate the working mode of conventional acoustic simulator, but also can simulate more complex target bearing changing, and can be applied to underwater weapon homing hardware in the loop simulation.