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Most current Super Resolution (SR) microscope techniques surpass the diffraction limit at the expense of temporal resolution, compromising their applications to live cell imaging.Here, we describe a new SR fluorescent microscopy based on confocal microscope optics, which we named as Spinning Disk SuperResolution Microscope (SDSRM).Theoretically, SDSRM is equivalent to structured illumination microscopy (SIM) and achieves a spatial resolution of 120 nm, double that of the diffraction limit of widefield fluorescent microscopy.However, SDSRM is 10 times faster than conventional SIM because SR signals are recovered by optical demodulation through the stripe pattern of the disk.Therefore a single SR image requires only a single averaged image through the rotating disk.Based on this theory, we have modified a commercial spinning disk confocal microscope.The improved resolution around 120 nm was confirmed with biological samples.The rapid dynamics of microtubules, mitochondria, lysosomes and endosomes were observed with temporal resolutions of 30-100 frames per second.Since our method requires only small optical modifications, it will enable an easy upgrade from an existing spinning disk confocal to a SR microscope for live cell imaging.