A word line driver comprising: a substrate comprising an NMOS, N-Metal-Oxide-Semiconductor, area and a PMOS, P-Metal-Oxide-Semiconductor, area; wherein the PMOS area comprises a plurality of first active areas extending along a first direction, and each first active area comprises a first channel area, and a first source area and a first drain area respectively located on opposite sides of the first channel area, wherein the NMOS area and the PMOS area are arranged along a second direction perpendicular to the first direction, the NMOS area comprises a plurality of second active areas extending along the first direction, each second active area comprises a second channel area, and a second source area and a second drain area respectively located on opposite sides of the second channel area, and the each second active area further comprises a third channel area, and a third source area and a third drain area respectively located on opposite sides of the third channel area; first gates, wherein the first gates are electrically connected to a main word line, a first gate, a first source area and a first drain area constitute a pull-up transistor, a first gate, a second source area and a second drain area constitute a pull-down transistor, the pull-up transistor and the pull-down transistor are electrically connected to a same sub word-line, and an extension direction of first gates corresponding to a first active area are inclined compared with the first direction; and a plurality of second gates, wherein each second gate covers a corresponding third channel area, and a second gate, a third source area and a third drain area constitute a holding transistor, wherein, for a same holding transistor, a third drain area is electrically connected to a second drain area of a pull-down transistor and a third source area is electrically connected to a second drain area of another pull-down transistor. a substrate comprising an NMOS, N-Metal-Oxide-Semiconductor, area and a PMOS, P-Metal-Oxide-Semiconductor, area; wherein the PMOS area comprises a plurality of first active areas extending along a first direction, and each first active area comprises a first channel area, and a first source area and a first drain area respectively located on opposite sides of the first channel area, wherein the NMOS area and the PMOS area are arranged along a second direction perpendicular to the first direction, the NMOS area comprises a plurality of second active areas extending along the first direction, each second active area comprises a second channel area, and a second source area and a second drain area respectively located on opposite sides of the second channel area, and the each second active area further comprises a third channel area, and a third source area and a third drain area respectively located on opposite sides of the third channel area; first gates, wherein the first gates are electrically connected to a main word line, a first gate, a first source area and a first drain area constitute a pull-up transistor, a first gate, a second source area and a second drain area constitute a pull-down transistor, the pull-up transistor and the pull-down transistor are electrically connected to a same sub word-line, and an extension direction of first gates corresponding to a first active area are inclined compared with the first direction; and a plurality of second gates, wherein each second gate covers a corresponding third channel area, and a second gate, a third source area and a third drain area constitute a holding transistor, wherein, for a same holding transistor, a third drain area is electrically connected to a second drain area of a pull-down transistor and a third source area is electrically connected to a second drain area of another pull-down transistor.