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In order to solve the problems of poor quality and low efficiency demodulation output signal of common AM algorithm parametric array, a dynamic carrier AM algorithm was designed. Based on this algorithm, a DSP process platform was designed which implemented parametric array. Real-time and stability of system have realized by optimal hardware design and software design. Finally, using composite signal of 500Hz、800Hz and 1100Hz as the test signal, we got the wave of system output and signal’s spectrum 5 meters ahead of parametric array. By comparing with the measured waveform and theoretical waveform, the system is verified to be reliable. And the fact was verified that the output signal of dynamic carrier AM parametric array has better SNR and higher output power by comparing with the dynamic carrier AM parametric array’s signal spectrum and common AM parametric array’s signal spectrum.