Vertical　and　lateral　dynamic　soil　pressure　characteristics　were　studied　by　site　tests　under　different　impact　rolling　times,　lines　and　velocities.　It　is　found　that　the　impact　rolling　load　has　a　transient　shocking　effect　on　the　embankment　and　the　dynamic　soil　pressure　near　the　load　increases　accumulatively.　The　dynamic　soil　pressure　is　closely　related　to　impact　rolling　times,　lines　and　velocities.　Along　with　the　impact　roller　coming　from　the　near　to　the　distant,　the　dynamic　soil　pressure　increase　firstly,　then　decrease.　The　impact　roller　can　affect　the　embankment　in　a　distance　of　30　m　to　the　test　location　and　effect　significantly　in　a　distance　of　15　m.　Under　different　impact　rolling　times,　the　dynamic　soil　pressure　increases　firstly,　then　decreases.　Resulted　from　the　diffusion　of　load　effected　by　Portland　cement-concrete　pavement　(PCCP)　and　the　base,　the　dynamic　soil　pressure　is　just　only　one-tenth　of　that　impact　directly　on　embankment.　The　research　shows　that　the　actual　influence　depth　of　embankment　using　impact　roller　is　greater　than　the　result　of　FEM;　and　the　horizontal　influence　distance　is　about　10　m.