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Glass transition in thin films has drawn lots of attention in the past two decades,since it was found the glass transition temperature of thin films deviated from the bulks[1],but the nature is still only partially understood.Being easy to prepare and direct access of measurement,polymers have proved to be suitable systems for glass transition investigation.Recently,there have been researches showing that super-cooled liquids exhibit dynamic heterogeneity,including both spatial and temporal heterogeneity.