Abstract: The FFH/MFSK communication scheme is proposed for long range deep-water acoustic communication.The scheme employs fast frequency hopping(FFH) to suppress severe multipaths interference effectively and reduce bit error rate.Using the characters of the deep-water acoustic channel and putting the communication modems at the depth corresponding to the minimal sound velocity value can improve the range of communication efficiently.The results of simulation and experiment show that proposed method has outstanding advantage in performance of bit error rate(BER).