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PAGEI Acknowledgements Manypeoplehavemadeinvaluablecontributions,bothdirectlyandindirectly,tomyresearch.Ifeeldeepgratitudetoallthosewhohaveofferedmesupport,helpandencouragementduringmystudyinJiangsuUniversityofScienceandTechnology. Firstofall,IamobligedtoexpressmysinceregratitudetomysupervisorProfessorZhaoXiawhohasgivenmealotofguidanceinmystudyofcognitivelinguistics,andmadepainstakingeffortstoinstructmeinthethesis-writing.Herkindnessandefficiencywilldefinitelyexertprofoundinfluenceonmyfuturelifeandwork. MydeepthanksmustgotoProfessorChengShanzhen,ProfessorZhouShujun,ProfessorGeJihong,ProfessorDaiYuqun,ProfessorZhangHongyan,ProfessorXiaGanlinandProfessorJiangWei,fortheirinstructivelecturesthatIhaveattended. Ishouldalsoexpressmygenuinegratitudetomywife,myclassmatesandroommateswhohavehelpedmeduringtheseyears. Lastbutnotleast,thethesisowesitsexistence,toalargeextent,toalargebodyofrelatedmaterials.Mybibliography,inthisrespectcanberegardedasthemostgenuineactofthankstotheauthorsofthosematerials.Abstract Abstract PAGEIII Abstract PAGEII Abstract LexicalpolysemyisthemostpervasiveandthemostimportantsemanticphenomenoninEnglish.Therefore,ithasbeenthefocusoflinguists’researches.Thetraditionalstudiesareconfinedtotheexternalreasonsthatcausethechangesofmeaningsofpolysemouswordswithouttakingaccountoftheirunderlyingcognitivemechanisms.Theyfailtorevealtheessentialnatureofpolysemouswords.Thepolysemousphenomenonhasattractedmuchconcernofcognitivelinguiststoo.Someofthecognitiveresearchersfocusedtheirmindstoomuchontheclassificationofthesemanticsystemofpolysemouswords(王德春,2002).Otherslaytheiremphasisontheanalysisofpolysemousperceptionwordsorbodily-partwordssuchashandorheart.However,theresearchwhichsystematicallystudiesinternalsemanticrelationsofpolysemouswordsandexplainsthenatureofthedevelopmentofthemeaningsofpolysemouswordsisstillrareintermsofcognitivelinguistics. Thisthesisconductsastudyofpolysemouswordsfromacognitiveperspectivewithintherelevanttheoreticalframeworkofcategorizatio