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Biomedical optical Imaging, as a powerful tool has been applied for observing biomedical tissue structural and functional information with high resolution and contrast unattainable by any other method. However, the high scattering of turbid biological tissues limits the penetration of light, leading to strongly decreased imaging resolution and contrast as light propagates deeper into the tissue. Fortunately, novel tissue optical clearing technique provide a way for reducing the scattering of tissue and improving the optical imaging quality. This presentation will introduce our progress from in vitro and in vivo of tissue optical clearing imaging, including developing in vitro optical clearing methods, such as FDISCO and MACS. Meanwhile, we will also demonstrate in vivo skull/skin optical clearing window for imaging structural and functional of cutaneous / cortical vascular and cells, also manipulating cortical vasculature.