Abstract: By analyzing the basic principle of CCD measure and working conditions underground of coal mine，noting that several shortage of coal mine height of coal CCD sensor model，and an improved measurement model has been given，that is improve Gauss-Laplachian counted using cluster analysis sub-image segmentation algorithm，more accurate edge of auxiliary light spot imaging has been extracted in the condition of disturbances by dust and coal surface diffuse，thus reducing the requirements of installations and parameters measuring device calibration，and noise immunity of measuring apparatus and measurement error has been improved.Experimental data analysis shows that the proposed measurement method can satisfy the requirements of level measurement，and can adapt to the underground bunker environment.