Abstract: The Signal System of high speed railway operates in the complicated electromagnetic environment. During the interference characteristics analysis and data processing, a universal platform for various analog and digital signals should be established. An integrated data processing platform based on LabVIEW software was developed, consisting of data acquisition, data format conversion and signal processing. The platform could collect the signal of the analog source, and import the stored data of the recorder, acting as a universal processing platform. On this basis, the impact of the transient characteristics of high speed railway traction current on the signal was analyzed, and the detection of singularity of transient interference based on wavelet transformation was accomplished. Finally, by processing of the actual waveform recorded at the railway site, the validity of the platform function and algorithm were verified. The signal processing part could implement the functions of real-time measurement in time domain, waveform display, filtering and spectrum analysis.