Abstract: The technique of dual re-perforation is a new synergis-tic technique in recent years with a good application effect in many oil fields.The principle and technical features of the dual re-perforation technology is briefly introduced.The application in well B320 in Henan oil field suggests that when the technology is used in cracking oil horizons under the same geological setting,the cracking pressure is sharply reducing;the sand amount needed is increasing;the pro-duced fluid volume after cracking is increasing;and the wa-ter injection is increasing.The technology is especially appli-cable to the low-porosity and-permeability oil and gas ho-rizon.