An exemplary TFT array substrate includes: an insulating substrate (201), a gate line (23) and a repair structure (272) arranged on the insulating substrate, a gate insulating layer (204) covering the gate line and the repair structure; a data line (27) arranged on the gate insulating layer corresponding to the repair structure, which is insulated from the gate line and intersects with the gate line. The repair structure has a gap (274). The gap of the repair structure is located at where the repair structure overlapping to the gate line.