In order to solve the problem of phased nonlinear acoustic field could not be modeled by one order parabolic approximation KZK equation, equivalent parametric array primary frequency natural directivity acoustic field model was built based on primary frequency collimate characteristic, and the equivalent relation between this field and the primary frequency phased acoustic field was built, so the problem of phased nonlinear acoustic field modeling was transferred to equivalent parametric array source condition calculation, and an operator split time domain finite difference numerical calculation method was derived, the rectangular aperture parametric array phased nonlinear field calculation based on KZK equation was realized. Let the SES2000 parametric array acoustic field as subjects, the phased nonlinear acoustic model and the corresponding field calculation method were examined by computer simulation and pool contrast experiment.
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