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This paper analyzes the seamless railway welded joints’ impact on vehicle safe driving. The track irregularity detection based on the vibration response of operating vehicles has the advantages of high efficiency and low cost. The blind source separation algorithm is applied to analyze the vehicle vibration repose signals in this paper. The blind source separation algorithm directly processes the vibration response signals without the prior knowledge of the source signals and the parameters of the channels, which reduces the difficulty of extracting the characteristic signals of the track joints. Field test was carried out on the track joint irregularity of Nanjing to Ningqi line, and the test results were analyzed by matlab programming. The analysis results show that the blind source separation algorithm used in this paper can extract the feature information of the track joint irregularity.