The patterning by Fountain-pen nano-lithography (FPN) with silver nanoparticles ink was reported. The FPN, a kind of pen-type nano-lithography technique, enables on-demand patterning of micro-meter size at wide area. At first, preparation of silver nanoparticles ink and patterning condition by FPN with the ink were investigated. Then the printed wires with disconnection of OTFT were repaired by FPN with the ink. The repaired lines showed electrical conductivity. These results suggest the possibility that the FPN technique is able to become powerful tool for repairing of device patterning.