An embodiment of the invention provides an array substrate of a thin film transistor liquid crystal display comprising a gate line and a data line formed on a base substrate, a pixel electrode formed in a pixel region defined by intersecting of the gate line and data line, and a thin film transistor (TFT) formed at the intersection as an switch device. The TFT comprises a gate electrode, a gate insulating layer, a transparent conductive layer, a source electrode and a drain electrode, an ohmic contact, a semiconductor layer, and a passivation layer in order from the base substrate. At the drain electrode side the transparent conductive layer is formed by the same layer as the pixel electrode and contacts with the drain electrode, and the source electrode is connected with the data line.