Array substrate, manufacturing method of array substrate, GOA unit and display apparatus

An embodiment of the invention provides an array substrate, a manufacturing method of the array substrate, a GOA unit and a display apparatus, and relates to the display technical field. The array substrate comprises a gate electrode formed on the surface of a substrate, a gate insulation layer, an active layer and a source drain metal layer. The source drain metal layer is used for forming source and drain electrodes and channel regions of TFTs. The array substrate comprises a plurality of first TFTs and a plurality of second TFTs, wherein the length of the channel region of the first TFT is smaller than the length of the channel region of the second TFT. The array substrate in the invention is capable of preventing the poor open circuit due to the disconnection of the TFT channel regions in the GOA unit.