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This paper presents the study on the enhanced coherent THz Smith-Purcell superradiation excited by two modulated electron-beam passing through the 1-D sub-wavelength holes array.The results show that the two electron beams can be coupled with each other through the holes array so the intensity of the radiated field has been enhanced about 3 times compared with that excited by one electron beam.The smith-purcell superradiation with the angle corresponding to the 2nd harmonics frequency component of the electron bunches has been clearly observed and in this mechanism 0.62THz radiation can be generated with 10A/cm2 current density.