Terrain　music,　the　study　of　terrain　feature　lines,　describes　terrain　undulation　patterns　in　audible　form.　This　paper　takes　terrain　music　as　the　starting　point　to　simulate　and　quantify　the　morphology　of　terrain　characteristic　lines,　and　further　discusses　the　spatial　differentiation　characteristics　and　laws　of　the　terrain　on　the　Loess　Plateau.　Based　on　the　DEM　data　with　a　resolution　of　30　m,　53　typical　watersheds　evenly　distributed　on　the　Loess　Plateau　in　northern　Shaanxi　were　selected　as　test　sample　areas,　and　the　music　theory　knowledge,　digital　terrain　analysis,　and　geostatistical　theory　were　integrated.　The　watershed　boundary　profile　was　taken　as　the　entry　point　to　realize　the　digital　expression　of　the　land　surface　morphology.　The　Kriging　method　was　used　to　construct　a　spatially　differentiated　map　of　terrain　music　index,　so　that　the　spatial　distribution　patterns　and　characteristics　of　the　terrain　could　be　further　analyzed.　On　this　basis,　the　spatial　distribution　of　terrain　music　index　on　the　Loess　Plateau　in　northern　Shaanxi　and　the　comparative　analysis　with　traditional　indicators　were　further　discussed.　Results　show　that　the　terrain　music　index　can　quantitatively　describe　and　reveal　the　spatial　distribution　characteristics　of　the　terrain　from　multiple　angles:　The　correlation　coefficient　between　jump-in　index　and　terrain　undulation　is　-0.486,　which　quantitatively　describes　and　reveals　the　spatial　distribution　characteristics　of　terrain　from　the　degree　of　terrain　undulation;　The　correlation　coefficient　between　the　grade　progression　index　and　slope　is　-0.328,　which　quantitatively　describes　and　reveals　the　spatial　distribution　characteristics　of　terrain　from　the　degree　of　slope　of　the　terrain;　The　correlation　coefficient　between　the　modal　progression　index　and　the　profile　curvature　is　-　0.309,　which　quantitatively　describes　and　reveals　the　spatial　distribution　characteristics　of　the　terrain　from　the　degree　of　terrain　curvature.　This　study　expands　the　research　scope　of　digital　terrain　analysis　and　promotes　the　integration　of　music　theory　and　geomorphology　research,　which　further　reveals　that　the　application　scope　of　terrain　music　related　research　methods　in　the　field　of　geomorphology　is　different　from　that　of　traditional　methods.　This　study　examines　the　characteristics　and　internal　mechanisms　of　spatial　differentiation　of　terrain　from　the　perspective　of　audibility,　which　deepens　the　understanding　of　development　processes　and　internal　mechanisms　of　terrain　on　the　Loess　Plateau.　©　2023　Journal　of　Geo-information　Science.　All　rights　reserved.