Recovering　the　expansion　work　by　replacing　throttle　valve　with　expander　may　improve　the　performance　of　a　thermodynamic　cycle.　Based　on　Kalina　Cycle　System　11,　34,　and　34　g,　different　redesigned　cycles　with　single　screw　expander　are　proposed　in　this　paper.　I-redesigned　cycle　has　a　single-screw　expander　which　replaces　the　throttle　valve　and　is　located　between　absorber　and　regenerator.　In　II-redesigned　cycle,　the　single-screw　expander　is　located　between　regenerator　and　separator,　and　the　original　throttle　valves　is　removed.　The　thermodynamic　performance　of　two　redesigned　cycles　is　analyzed　and　compared　with　their　corresponding　original　cycle.　It　can　be　found　that　two　redesigned　cycles　perform　better　than　their　corresponding　original　cycle　system.　II-redesigned　cycle　is　better　than　I-redesigned　cycle.　When　comparing　the　redesigned　cycle　of　the　same　type,　the　performance　ranking　from　good　to　bad　is　Kalina　Cycle　System　34,　11,　and　34　g.　II-redesigned　cycle　for　Kalina　Cycle　System　34,　11　and　34　g　can　reach　the　maximum　thermal　efficiency　of　11.44%,　11.14%,　and　10.85%　respectively　at　the　evaporation　pressure　of　3.0　MPa.　It　can　be　seen　that　the　series　connection　of　regenerator　and　evaporator　is　better　than　the　parallel　connection　and　the　increase　in　the　number　of　regenerators　can　improve　the　thermodynamic　performance　of　the　cycle.