Abstract: A thin film transistor is provided. The thin film transistor disposed on a substrate includes a gate electrode, a gate dielectric layer, a patterned semiconductor layer, a source electrode, a drain electrode covered with an anticorrosive conductive layer, a patterned passivation layer and a transparent conductive layer. The anticorrosive conductive layer includes indium tin oxide or indium zinc oxide, and is used to prevent the drain electrode from being over etched during the process of etching the passivation layer. A method for manufacturing the thin film transistor is also provided herein.