The　aim　of　this　study　is　to　analyze　how　internal　operating　sub-processes　and　annual　operations　of　airport　companies　influence　the　overall　efficiency.　The　multi-period　Network　Data　Envelopment　Analysis　is　used　to　evaluate　the　efficiencies　and　the　efficiency　changes　for　East　Asia　airport　companies.　The　results　indicate　that　the　overall　efficiencies　of　airport　companies　during　a　specified　period　of　time　are　affected　by　the　system　efficiency　and　the　sub-processes’　efficiencies　in　individual　periods.　Furthermore,　the　overall　efficiency　change　is　determined　by　the　sub-processes’　efficiency　changes.　According　to　the　operating　decision　analysis　matrix,　managers　can　discover　the　inefficient　sub-processes　and　formulate　the　improvement　countermeasures.　©　2016　Elsevier　Ltd