Existing　research　on　the　linear　sliding　window　system　(SWS)　has　focused　on　modeling　and　extending　to　different　system　structures.　Little　research　has　devoted　to　analyzing　the　performance　redistribution　internally.　This　research　considers　an　SWS　with　a　common　bus　such　that　the　performance　can　be　redistributed　among　system　elements.　The　reliability　model　of　an　SWS　with　a　common　bus　is　built　with　consideration　of　performance　sharing.　We　extend　the　universal　generating　function　technique　to　represent　the　states　of　the　system,　and　formulate　an　optimization　problem　to　determine　the　optimal　performance　sharing　policy.　We　further　suggest　a　reliability　evaluation　algorithm　based　on　the　representation　function　of　the　system　states　and　the　optimal　performance　sharing　policy.　Optimal　allocation　of　the　system　elements　is　also　considered　in　this　work.　Numerical　studies　show　that　the　system　reliability　can　be　improved　by　considering　a　common　bus　performance　sharing.　The　optimal　allocation　of　system　elements　can　also　increase　the　system　reliability　without　incurring　extra　costs.