At present, most elevator audio systems, which are designed by using special audio chip, are far from being flawless.The elevator audio system based on MP3 is designed which is based primarily on STC89C58RD+C、CPLD、VS1011E and Flash and so on.According to the information input controller to control CPLD issued orders and transmit data to the receiving CPLD orders in accordance with the rules of logic and literacy Flash MP3 set of internal control registers and data transmission audio, MP3 analog signal can be output directly to an external power amplifier audible.This system succeeds the intelligence and automation of elevator voice service.