The　deck　joints　between　the　bridge　deck　and　approach　slab　can　be　eliminated　in　jointless　bridges,　which　become　more　and　more　popular.　The　approach　slab　of　jointless　bridge　can　not　only　alleviate　the　differential　settlement　between　the　bridge　deck　and　embankment,　but　also　transfer　and　absorb　the　longitudinal　thermal　movement　of　the　superstructure.　The　soil-structure　interaction　(SSI)　between　the　approach　slab　and　embankment　soil　is　an　important　factor.　The　experimental　tests　on　flat　buried-typed　approach　slab　(FBAS)　considering　SSI　were　carried　out.　With　the　increase　of　depth,　the　initial　linear　part,　the　nonlinear　part　and　the　second　linear　part　the　force-displacement　curve　was　increased　to　varying　degrees,　and　the　deformation　of　soil　surface　in　vertical　direction　were　decreased　and　that　in　horizontal　direction　increased.　Finally,　some　recommendations　were　proposed　to　optimize　the　behavior　of　FBAS.　This　analysis　can　provide　a　reference　for　the　application　of　FBAS　in　jointless　bridges.　©　2021　Taylor　&　Francis　Group,　London