To　investigate　the　preferential　distribution　of　grain　boundary　planes　in　a　hot　rolled　aluminum　alloy,　the　electron　backscattered　diffraction　approach　and　five-parameter　analysis　method　are　used　to　characterize　the　grain　boundary　plane　distributions　in　a　hot　rolled　5A06　aluminum　alloy,　and　the　results　show　that　the　orientations　of　grain　boundary　planes　are　textured.　Grain　boundary　planes　favor　the　{111}　orientation　at　the　center　of　the　specimen,　and　their　population　is　56%　higher　than　that　in　a　random　distribution,　whereas　grain　boundary　planes　favor　the　{110}　orientation　on　the　surface　of　the　specimen,　and　their　population　is　69%　higher　than　that　in　a　random　distribution.　Moreover,　this　anisotropic　distribution　of　grain　boundary　planes　occurs　at　all　misorientation　angles.　The　study　suggests　a　new　understanding　of　the　pathway　to　evaluate　the　crystallographic　orientation　dependent　performances.