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Ⅰ .IntroductionTheopeningpolicysince 1 978hasbroughtgreatprosperityineconomicandsocialdevelopmentinChina.Inrecentyears ,agreatconcernhasbeenputonthenationaleducationlevelandstudents’academicachievementinschools .Moreandmorepeoplehavehighvalueoneducationandseeschooleducationasanecessaryinstrumentfortheirchildrentohaveabetterfuture .Theyregardschoolasapotentialvehicletopreparetheirchildrentogainopportunitiesforhigherincomeaodoccupationalstatusandthusensuretheirupwardsocialmobility.Becauseofthevastnessofthecou...