To fulfill the ADC applied on communication and imedia technology, this article researches the ADC’s Nonlinear error testing method based on Sine Wave click rate technology,and realizes the application of Sine wave click technology in ADC’s nonlinearity error testing.Put the sine wave into ADC’s input, deal the output data with normalized conduct to compensate the uneven distribution of sine waveform voltage, and then,calculate the ADC’s differential Nonlinearity Error by means of click rate algorithm, at the end, verify reliability and accuracy of the algorithm at the escale mixedsignal test equipment Catalyst200.The experimental results show that this algorithm can estimate the ADC’s nonlinearity error accurately, represent the ADC’s linearity and dropout rate entirely, provide important parameter to the application of ADC on communication and imedia technology. it has a strong engineering practicality and a fine market outlook.