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In view of the current electrified railway catenary geometry parameters daily testing requirements, this paper proposes a catenary geometry parameter detection method based on laser scanning, the combination of hardware, such as laser scanner and industrial control, photoelectric encoder, programming processing to achieve the relevant geometric parameters of the non-contact sampling, sampling point positioning and data processing for catenary of various geometric parameters, through the experiment the method can effectively improve the catenary geometry parameters detection precision, measurement accuracy is ±3 mm, has practical significance.