The present invention provides an array substrate and a manufacturing method thereof, and a display apparatus. The array substrate comprises a gate layer, a gate insulating layer, an active layer, a source and drain layer, a scanning line and a signal line formed on a substrate, the signal line is provided in a same layer as the gate layer, the scanning line is provided in a same layer as the source and drain layer, the gate insulating layer is provided between the gate layer, the signal line and the active layer. The array substrate further comprises a first through hole and a second through hole penetrating through the gate insulating layer, the signal line is connected to the source and drain layer via the first through hole, and the scanning line is connected to the gate layer via the second through hole. The present invention can increase a thickness of a power supply line without causing too much influence on formation processes of other structures, thus an influence of IR drop is suppressed.