This　paper　reports　new　research　progress　on　characterizing　the　burden　surface　particles　of　the　blast　furnace.　An　algorithm　is　proposed　to　extract　the　contour　of　the　particles　on　the　burden　surfaces　from　their　digital　elevation　models.　The　statistical　distributions　of　particle　size　corresponding　to　the　coke　and　sintered　ore　burden　surfaces　are　counted　from　the　extraction　results　of　the　particle　contours.　The　statistical　results　obtained　in　the　former　research　are　compared　with　those　of　here.　The　particle　surface　height　distributions　can　be　approximated　based　on　the　burden　particle　size　distributions.　The　peak　positions　of　the　estimated　particle　surface　height　distribution　are　consistent　with　that　of　the　burden　surface　height　distribution.　©　2024　Iron　and　Steel　Institute　of　Japan.　All　rights　reserved.