Abstract: To analyze the decay law of angularity characteristics of coarse aggregates in asphalt pavements and its correlation with skid performance, both coarse aggregates used in the surface layer obtained from on-site core samples and coarse aggregates abraded by the Los Angeles Abrasion Machine in the laboratory were investigated by 2D digital image processing and 3D laser scanning technology, respectively. Quantitative analysis of aggregate angularity was carried out after obtaining 2D images and 3D digital models. The skid resistance of pavements was tested by using a dynamic friction tester. The 2D angularity evaluation indexes of convexity (CV), aspect ratio (AS) and roundness (RO), and the 3D angularity evaluation indexes of needleness (ND), flatness (CS), sphericity (DS) and shape factor (SF) were used to evaluate the angularity and analyze their change rules. Finally, a pavement skid resistance prediction model was established by selecting the optimal angularity evaluation indexes and combining with the micro-texture indexes. Result shows that the 2D angularity evaluation indexes are not suitable for evaluating the decay law of the angularity due to the significant influence of the placement on the 2D imaging, while the 3D angularity evaluating method can better characterize the change of aggregate morphology, and the accuracy of the pavement skid resistance prediction model established by using 3D angularity evaluation indexes including DS and SF, is as high as 80%.