An audio conversion characteristic test method, comprising the steps of: providing an audio channel communication system comprising a sending module, a system network, a receiving module and a conversion device, wherein the sending module comprises a first audio signal generator, a first local interphone and an audio analyzer; the first audio signal generator generating and sending a test signal unit to the first local interphone, and the first local interphone sending the received test signal unit to the receiving module via the system network; wherein the test signal unit is sent to the receiving module after a first time delay; the receiving module receiving the test signal unit, the conversion device executing a conversion operation, and the receiving module outputting feedback information to the audio analyzer according to the test signal unit; the audio analyzer calculating a first time period for the feedback information to be transmitted in the audio channel communication system, wherein the first time period is a time period from a moment the receiving module sends the feedback information to a moment the amplitude of sound of feedback information in the audio channel communication system is lower than a first preset value when the feedback information is transmitted in the audio channel communication system; acquiring a second time delay from the moment the receiving module sends the feedback information to a moment the audio analyzer of the sending module receives the feedback information, and defining the first time period deducted by the second time delay as a conversion time; and comparing the conversion time with a preset first threshold value, if the conversion time is not greater than the first threshold value, requirements being satisfied; otherwise, the conversion time not satisfying the requirements, and optimizing the conversion device. providing an audio channel communication system comprising a sending module, a system network, a receiving module and a conversion device, wherein the sending module comprises a first audio signal generator, a first local interphone and an audio analyzer; the first audio signal generator generating and sending a test signal unit to the first local interphone, and the first local interphone sending the received test signal unit to the receiving module via the system network; wherein the test signal unit is sent to the receiving module after a first time delay; the receiving module receiving the test signal unit, the conversion device executing a conversion operation, and the receiving module outputting feedback information to the audio analyzer according to the test signal unit; the audio analyzer calculating a first time period for the feedback information to be transmitted in the audio channel communication system, wherein the first time period is a time period from a moment the receiving module sends the feedback information to a moment the amplitude of sound of feedback information in the audio channel communication system is lower than a first preset value when the feedback information is transmitted in the audio channel communication system; acquiring a second time delay from the moment the receiving module sends the feedback information to a moment the audio analyzer of the sending module receives the feedback information, and defining the first time period deducted by the second time delay as a conversion time; and comparing the conversion time with a preset first threshold value, if the conversion time is not greater than the first threshold value, requirements being satisfied; otherwise, the conversion time not satisfying the requirements, and optimizing the conversion device.