An array substrate and a manufacturing method thereof, and a display apparatus comprising the array substrate are provided. The array substrate comprises a base substrate, and a thin film transistor and a storing capacitor provided on the base substrate, the thin film transistor comprises a gate, a source, a drain and a gate insulation layer provided between the source and drain and the gate, the storing capacitor comprises a first plate, a second plate and a dielectric layer provided between the first plate and the second plate, wherein, both of the first plate and the second plate are formed of metal material, and the dielectric layer is formed of the same material as the gate insulation layer. In the array substrate of the present invention, the charging speed of the storing capacitor can be improved and the display quality of the display apparatus comprising the array substrate is further improved.