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In order to detect the tiny displacement of the precision mechanism, according to the theory of displacement coding and machine vision technology,the MLS-based visual target schemes are figured out. Based on the algorithms of gray superposition and image binarization,the image of visual targets is processed and the target absolute position is then recognized. Further, the precise positioning is studied based on a phase-fitting method, and thereby, the precision measurement of one-dimension absolute displacement is realized with experimental verification carried out. The preliminary experiment results confirms that the MLS-based absolute displacement detection method is effectively capable for one-dimension absolute displacement detection with a positioning accuracy falling in the range of ±2 μm, and exhibits excellent repeatability and robustness, as well as the sound advantage of being free of visual calibration of the CCD camera.