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A novel method is proposed to realize compact, high-performance optical buffering application based on the polymer-infiltrated photonic crystal waveguide. By adjusting the radii of the first two rows of holes adjacent to the defect, the negligible dispersion bandwidth ranging from 2.8 nm to 13.8 nm and the corresponding constant group velocity are obtained, which are suitable for the requirement of optical buffers. Then the buffer capability and dynamic modulation of dispersion engineering waveguide are systemically studied. The simulation shows that the center wavelength shift, delay time and storage capacity increase almost linearly as the applied voltage increases. And the modulation sensitivities are about 0.386 nm/V, 0.8 ps/V and 0.37 bit/V, respectively. These results show that the proposed structure has considerable potential for optical buffering application.