A combination hole punching and book binding machine having a worktable and an electric motor disposed fixedly thereon, a left changeover panel and a right changeover panel being symmetrically disposed on the worktable, a press knife assembly being disposed between the left changeover panel and the right changeover panel. By gradually reducing the magnetic field, the magnetized material within the borehole is demagnetized. Thus, the semiconductor device can have low interface state density and small flat band voltage shift even when Al2O3, etc.