The invention discloses an active array base plate and a liquid crystal display panel and method for preparation. The active array base plate comprises a base, a plurality of scan lines, a plurality of data lines, a plurality of pixel electrodes, a plurality of active elements, and a height auxiliary structure, wherein the scan lines are arranged on the base, the data lines are vertical to the scan lines, each active element is respectively electrically connected with the corresponding scan lines, data lines and the pixel electrodes to define a pixel area, the height auxiliary structure is generally arranged on the upper of the active element, the data lines or the scan lines, and the top patterns of the height auxiliary structure are a round, a similar round, an oval, a closed irregular graphic without angles or a closed irregular graphic without a right angle.