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Microring resonator optical buffer is attractive in high-speed optical network system, but ordinary microring resonator use strip waveguide as its basic light guide medium, which cannot provide small footprint, low dispersion and high delay-bandwidth product (DBP) simultaneously. Double-slot waveguide structure was first proposed to construct racetrack-microring resonators. It was found that cascading multiple microrings can increase the delay-bandwidth and lower the dispersion of the resonators by optimizing the structure parameters. Optical buffer cascaded by 8 microrings with fiat bandwidth of 20 GHz provided the delay of 150 ps and the dispersion of -10-7 ps/um over 1530-1630 nm, and the footprint of each microring was about 511ma2. This study can provide design methods and theoretical basis support for practical application.