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The technology of laser scan range finder is researched, a line laser is used to survey the object section outlines. The system is composed of line laser, CCD camera, Frame Grabber, computer and the software. The mathematical model of the system is defined and studied, the error is analysed, the calibration method is researched. the system is calibrated and tested, the result showed that the survey data moved towards with the stripe shape tallies and the system achieve the accuracy requirements.