Organic　Rankine　cycle　(ORC)　is　the　most　commonly　used　power　generation　cycle　that　is　adopted　in　this　paper　to　make　full　use　of　the　cold　exergy　of　liquefied　natural　gas　(LNG).　As　the　heat　exchangers　are　mainly　responsible　for　the　exergy　destruction　of　the　system,　two　improvement　techniques:　supercritical　system　and　unconventional　condenser,　are　proposed　to　decrease　the　exergy　destructions　in　steam　generator　and　condenser.　The　performances　of　ten　preselected　working　fluids　are　tested　by　optimizing　five　key　parameters　at　three　heat　source　temperatures.　The　results　show　that　using　the　supercritical　system　can　improve　the　system　efficiency　for　fluids　with　low　critical　temperatures　by　reducing　the　exergy　destructions　in　steam　generators.　Using　the　unconventional　condenser　can　greatly　improve　the　system　efficiency　by　decreasing　the　exergy　destruction　during　the　LNG　regasification　process　of　most　fluids,　barring　a　few　wet　expansion　fluids.　The　improvements　offered　by　both　techniques　become　more　obvious　as　the　heat　source　temperature　increases.　However,　combining　the　two　techniques　only　improves　the　performance　for　fluids　with　low　critical　temperatures,　and　does　not　work　for　most　fluids.　The　highest　efficiency　is　always　achieved　by　the　subcritical　system　with　an　unconventional　condenser　at　each　heat　source　temperature.　When　the　heat　source　temperatures　are　100　degrees　C　and　150　degrees　C,　R290　obtains　the　highest　efficiency　values　of　17.89%　and　21.26%,　respectively.　At　200　degrees　C,　R600a　achieves　the　highest　efficiency　of　25.35%.