Abstract: Provided are a voice communication method and system under a broadband and narrow-band intercommunication environment. The method comprises: when a broadband terminal calls a narrow-band terminal, the broadband terminal executing a reducing operation on an energy amplitude of voice data to obtain a reduced voice data packet, and sending the reduced voice data packet to the narrow-band terminal such that the narrow-band terminal plays the reduced voice data packet; and when the narrow-band terminal calls the broadband terminal, the broadband terminal receiving a voice data packet, and executing an amplification operation on an energy amplitude of the voice data packet to obtain an enlarged voice data packet, and the broadband terminal playing the enlarged voice data packet. The present application can solve the problem of voice size inconsistency between a broadband terminal and a narrow-band terminal, thereby enhancing the usage experience for a user.