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Electrical contact degradation will affect the signal integrity resulting in poor communication performance.In the present work,the effect of electrical contact degradation on wide-band digital signal integrity was studied using both the theoretical analysis and experimental testing.The characteristics of digital signals with rise times of 200ps,400ps,600ps and 800ps through connectors with different degradation levels were studied.The maximum bandwidth of these signals can reach up to 1.75GHz.An equivalent model of the connector with degraded contact surface was developed and the experimental results are consistent with the model results approximately.The influence of capacitance characteristics caused by degraded contact surface on digital signal waveform was calculated and analyzed.The results of this paper are helpful in developing a better understanding of the characteristics of wide-band digital signal waveforms through the degraded contact surface and provide a theoretical support to identify failure features in fault diagnosis.