This　research　aims　to　further　improve　the　thermal　performance　and　the　heat　charge　and　discharge　efficiency　of　the　developed　vertical　phase　change　thermal　energy　storage　device　(VPCTESD)　in　order　to　adapt　the　application　of　VPCTESD　in　solar　energy　utilization　technology　and　waste　heat　utilization　technology.　Based　on　the　developed　heat　transfer　model　of　VPCTESD,　with　experiment　and　numerical　simulation　methods,　this　paper　proposes　the　optimization　design　parameters　of　VPCTESD　filled　with　PCMs　(called　DX-53),　including　the　gap　between　DX-53　slabs,　the　velocity　of　HTF　(water)　in　heat　transfer　unit＇s　flow　passage,　the　thickness　of　DX-53,　the　filling　height　of　DX-53　and　divergent　length　of　entrance　region.　The　research　result　provides　the　reference　methods　for　evaluation　of　the　thermal　performance　of　VPCTESD.　(C)　2013　Elsevier　B.V.　All　rights　reserved.