摘要：DAt.5, a 5 m t.lescope for t.rahert. explorat.on, was proposed for acquiring observat.ons at.Dome A, Ant.rct.ca. In order t. observe t.e t.rahert. spect.um, it.is necessary t. maint.in high surface accuracy in t.e t.e ant.nna when it.is exposed t. Ant.rct.c weat.er condit.ons. St.uct.ral analysis shows t.at.bot. machined aluminum and carbon fiber reinforced plast.c （CFRP） panels can meet.surface accuracy requirement.. In t.is paper, one design concept.based on aluminum panels is int.oduced. t.is includes panel layout. det.ils on panel support. design of a CFRP backup st.uct.re, and det.iled finit. element.analysis. Modal, gravit. and t.ermal analysis are all performed and surface deformat.ons of t.e main reflect.r are evaluat.d for all load cases. At.t.e end of t.e paper, t.e manufact.re of a prot.t.pe panel is also described. Based on t.ese result., we found t.at.using smaller aluminum reflect.r panels has t.e pot.nt.al t. meet.t.e surface requirement. in t.e harsh Dome A environment.