Considering the limitations and complications in measuring the surface at high speed,a laser line triangulation technique is explored to measure surface topography in a wide scale.Based on the application of structured laser triangulation for pavement structure dept h detection,a novel centroid position algorithm of structure optical stripe is proposed in this pape r.Firstly,based on the characteristics of fine width and light intensity of laser beams,the fixed t hreshold and mean threshold are merged during pre-filter processing of the original image.Then, by means of maximizing the length of valid spot window,the interference of solitary noise, caused by diffuse reflection of coarse pavement is eliminated.Finally,the sub-pixel level gravi ty method is employed to extract the centroid position of a structure stripe.Experimental results show that the measurement accuracy can be up to 0.1mm.Compared with the dot area in the exist ing laser surface detection technology,the main contribution of the proposed method is to expand the detection object from dot to line,which can obtain continuous road data for three-dimensional m icroscopic surface texture reconstruction.