Surface　texture　is　a　very　important　factor　affecting　the　anti-skid　performance　of　pavements.　In　this　paper,　entropy　theory　is　introduced　to　study　the　decay　behavior　of　the　three-dimensional　macrotexture　and　microtexture　of　road　surfaces　in　service　based　on　the　field　test　data　collected　over　more　than　2　years.　Entropy　is　found　to　be　feasible　for　evaluating　the　three-dimensional　macrotexture　and　microtexture　of　an　asphalt　pavement　surface.　The　complexity　of　the　texture　increases　with　the　increase　of　entropy.　Under　the　polishing　action　of　the　vehicle　load,　the　entropy　of　the　surface　texture　decreases　gradually.　The　three-dimensional　macrotexture　decay　characteristics　of　asphalt　pavement　surfaces　are　significantly　different　for　different　mixture　designs.　The　macrotexture　decay　performance　of　asphalt　pavement　can　be　improved　by　designing　appropriate　mixtures.　Compared　with　the　traditional　macrotexture　parameter　Mean　Texture　Depth　(MTD)　index,　entropy　contains　more　physical　information　and　has　a　better　correlation　with　the　pavement　anti-skid　performance　index.　It　has　significant　advantages　in　describing　the　relationship　between　macrotexture　characteristics　and　the　anti-skid　performance　of　asphalt　pavement.