An exemplary method of repairing gate lines (201) of TFT array substrate, wherein the TFT array substrate includes a plurality of gate lines (201, 202), a plurality of data lines (211, 212, 213) crossing with the gate lines, a plurality of pixel electrode (221, 231), and a plurality of thin film transistors (240, 250), and one of the gate lines has a defect point (II). The method includes: cutting off an electrical connection between the gate electrode of one of the TFTs adjacent one side of the defect point and the corresponding data line, and cutting off an electrical connection between the gate electrode of one of the TFTs adjacent an opposite side of the defect point and the corresponding data line; electrically connecting the gate line having the defect point to each of two corresponding pixel electrodes that correspond to the two TFTs; and electrically connecting the two pixel electrodes.