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This paper analyzes the reasons of asynchronous between audio and video image for current 3G video phones. A solution for improving the synchronization between audio and video data is proposed. The solution proposed in this work mainly consists of software components, according to which hardware needs to be selected. It also gives the video phone terminal structure, block diagram for H.324M video phone terminal, the main software functional blocks, the implementation flow chart of each module and the whole implementation flow chart of the designed solution. The synchronization performance of audio and video can be improved by adding user interface module, timestamp monitoring module and audio decoder controlling module, as well as by detecting the current decoding states of both audio decoder chip and video decoder chip, by the use of software to control the decoding rate of the sound decoder and video decoder, improving the effects of 3G video phone communications.