A method for repairing and assembling contact image sensor module and structure thereof are provided. The method includes following steps: (1) making a sensor housing; (2) providing a PCB; (3) assembling the PCB into the sensor housing; (4) melting an end of a securing post located on the sensor housing and forming fastening means for fixing the PCB to the sensor housing; (5) testing the assembled CIS, if it can't pass the test, then cut off the fastening means and take away the PCB for repairing or replacing it; (6) cutting off the securing post located on the housing; (7) making an adapted post with a securing tip and fixing said adapted post to a corresponding position of the sensor housing on which the former securing post being located; (8) assembling the repaired or replaced PCB into the sensor housing, and make the securing tip of the adapted post passing through the securing hole and extending outwardly from the PCB; (9) melting the tip of the adapted post by the manner of hot-press and forming a new fastening means for fixing the repaired or replaced PCB to the sensor housing again.