Based　on　deep　analysis　about　the　essential　relation　between　two　input　variables　of　normal　two-dimensional　fuzzy　controller,　we　used　universal　combinatorial　operation　model　to　describe　the　logic　relationship　and　gave　a　flexible　logic　control　method　to　realize　the　effective　control　for　complex　system.　In　practical　control　application,　how　to　determine　the　general　correlation　coefficient　of　flexible　logic　control　model　is　a　problem　for　further　studies.　First,　the　conventional　universal　combinatorial　operation　model　has　been　limited　in　the　interval　[0,　1].　Consequently,　this　paper　studies　a　kind　of　universal　combinatorial　operation　model　based　on　the　interval　[a,b].　And　some　important　theorems　are　given　and　proved,　which　provide　a　foundation　for　the　flexible　logic　control　method.　For　dealing　reasonably　with　the　complex　relations　of　every　factor　in　complex　system,　a　kind　of　universal　combinatorial　operation　model　with　unequal　weights　is　put　forward.　Then,　this　paper　has　carried　out　the　parametric　analysis　of　flexible　logic　control　model.　And　some　research　results　have　been　given,　which　have　important　directive　to　determine　the　values　of　the　general　correlation　coefficients　in　practical　control　application.