The　anchorage　performance　of　steel　column　base　of　large　span　structure　is　one　of　the　key　problems　in　seismic　design.　The　steel　column　base　of　National　Stadium　is　anchored　in　reinforced　concrete　pile　cap,　whose　stress　state　is　complex,　and　similar　experiments　were　few　in　the　past　at　home　and　abroad.　Four　experimental　programs　were　carried　out　to　study　the　anchorage　performances　of　steel　column　bases,　and　two　specimens　of　reinforced　concrete　pile　caps-steel　column　base　whose　geometric　size　is　big　are　introduced　in　this　article.　One　is　fitted　up　with　an　anti-punching　shear　bar　and　the　other　is　not.　Through　the　tests　of　the　anchorage　performances　of　steel　column　bases　under　uniaxial　reversed　loads,　the　tested　ultimate　loads,　the　ductility　and　the　reasonable　modes　of　the　reinforcement　design　of　two　specimens　are　presented　in　this　paper.　Test　results　revealed　that　the　ultimate　loads　and　the　ductility　of　the　specimen　with　anti-punching　shear　bar　is　higher　than　that　of　the　corresponding　specimen.　Based　on　the　experimental　studies,　the　simplified　mechanic　model　is　proposed.　The　calculated　results　correlate　well　with　the　results　of　experiment.