This　paper　aims　to　fill　the　research　gap　of　the　relationship　between　the　access　travel　time　(ATT)　estimation　and　the　accessibility　to　high　speed　railway　(HSR)　station.　A　regression　analysis　was　developed　on　the　basis　of　risk-return　model　to　analyze　the　access　travel　time　estimation　error　(ATTEE).　The　data　sources　were　1595　valid　interview　survey　data　at　Beijing　South　Railway　Station　(BSRS),　China　in　October　2016.　The　factors　and　scenarios　included　travel　mode,　departure　time,　and　travel　date,　etc.　The　coefficients　of　ATT　estimation　were　obtained　by　different　travel　modes.　The　results　showed　that　the　expected　access　travel　time　(EATT)　has　positive　linear　correlation　with　the　actual　access　travel　time　(AATT).　Accessibility　was　calculated　by　the　ratio　of　AATT　to　EATT.　The　accessibility　coefficients　ranged　from　0.89　to　1.38　in　different　travel　modes,　departure　time,　and　travel　dates.　A　smaller　coefficient　indicates　better　travel　time　reliability　and　accessibility.　This　study　not　only　provides　a　useful　tool　to　estimate　the　travel　time　budget　required　for　access　to　HSR　station,　but　also　establishes　a　connection　with　the　accessibility　and　ATTEE.　It　offers　an　opportunity　to　estimate　ATT　to　HSR　stations　by　different　modes　of　transport,　which　can　help　to　better　understand　how　the　accessibility　of　the　feeder　transport　changes　at　different　time　periods.