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This paper presented a novel method using prism-based optical structure to correct the nonlinear problem of Laser Triangulation Displacement Measurement (LTDM). The nonlinearity existed in the common use of LTDM, especially in the wide range measurement. In this paper, a geometric model of the relation between object displacement and image position was built by theoretical derivation. Then two groups of contrast experiments were designed and the results showed the nonlinear problem was significantly improved.