Abstract: The cracks are one of the important causes of failure of metal products.By comparing the existing crack repair methods, the unique advantages of electric pulse repair crack technology such as targeting, high efficiency and environmental protection were demonstrated. According to the three kinds of mechanisms of compression filling, dislocation filling and diffusion filling of atom-filled cracks, the principle of pulsed current repairing cracks was analyzed. The research status of domestic and foreign scholars in repairing cracks by pulsed current was reviewed. The shortcomings and improvement measures of repairing cracks by pulsed current were discussed, and the future development trend of repairing cracks by pulsed current was pointed out.