200553112AbstractItisanundoubtedfactthattheimmenseimmigrationcausedbythreegorgesprojectembodiesthevolitionofthecountry,withthefar-reachingsignificancefarbeyondtheprojectitself.While,theessenceoftheimmigrationistrulynotasimpleprocessofspacemovingbutacomplicatedprocessofsocialrelationship’sbeingseparatedandrecombination,whichisthemaintopicofthisthesis,withthespecialcasesincluded.Theprocessofimmigrationbothshakedtheimmigrants’economybasisintopiecesandsplintedtheimmigrants’formersocialnetwork,causingallthesocialresourcesbeinglostwiththeimmigration.Undersuchconditions,strongtieexertsitspowerfulfunctioninkeepingtheformerculture,socialidentityandofferingthesenseofsafety.Whileinfact,nomatterinimmigrationspotorinimmigrationvillage,thestrongtiereallytakestheresponsibilityofunitingtheimmigrantsinanunfamiliarsurroundings.While,ontheotherhand,justbecauseofthesimilaritiesoftheinformationthestrongtiebares,thestrongtiealsosetsbarriersfortheimmigrantstomergeintothenewsurroundings,aunavoidableprocessfortheimmigrants.Thegrowthofthenewhomevividlymirrorstheprocessofimmigrants’socialnetworkandsocialstructure’sruptureandrecombination,aprocessinwhichthedecadenceofthestrongtiewiththeformerplacedecadenceandtheincreasesoftheweaktiewiththenewsurroundings.Thenaturalevolutionbetweenstrongtieandweaktiecanbeclearlyseenintheprocessofimmigrants’experienceofthem,inwhichtheimmigrants’wisdomwasalsoshown.Asasocialresource,theweaktieoffersit’sfunctioninthesocialnetworkrestructure,evolvingitselffromtheinvisibleresourcetovisibleone,whichcanserveforthedoer’sinterestsandobjects.Characterizedwiththehighheterogeneityandpregnantwiththeabundantpossibilities,theweaktieservesasabridgefortheimmigrantstocommunicatewiththenewsurroundings,thusprovidingconditionsforthesocialrestructure.Tillnow,theresearchintotheeconomycombinationinthecourseoftheimmigrantshasbeenmade,whileasforthefieldofsocialcombination,includingsocialstructuredisorganizationandrecombination,theresearchintoitisscarcelymade.Tofillthisacademicvacuumandonthebasisofpracticalcaseshappeningintheimmigrantcourse,thewritermademuchdiscussionabouttheconfinementofthestrongtieandthepossibilitiesoftheweaktie.Asforthecreativepointsofthisthesis,apowerfulideathattheweaktieandthestrongtiecanbeexchangedwitheachotherwasraised,withthenewconceptof“tieconversion”included,whichenjoysfar-reachingsignificanceespeciallyintherestructureofthesocialnetworkandsocialresource.Besides,the“tiesituation”broughtupanddiscussedinthisthesiswasanotherfreshidea,whichisexpectedtosupplysometheoreticalsupportsforthegovernment’srelevantstrategy.Keywordsthree-gorges/immigrant/weaktie/strongtie/rupturerecombination3.................................................................................1.................................................................................1.................................................................................2..........................................................3....................................................4......................................................................7.............................................................................10........................................................................................10....................................................................10....................................................................11..........................................................................12...................................................12...........................................................................13...........................................................................13...........................................................................15.............................................17..................................................................................17...................................................................17......................................................................18......................................................................18..........................................................18...................................................19..........................................................23..........................................................23..............................................25....................................................29.........................................................36.........................................................364..............................................36..........................................39..................................42..................................44..............................................................47...............................................................47....................................................50..............................................52................................................................53..............