We present a multi-modal optical diagnostic approach utilizing a combined use of Fluorescence Intravital Microscopy and Dynamic Light Scattering for in vivo functional imaging of tumor vascular network and blood microcirculation. Fluorescence Intravital Microscopy is used for imaging of tumor and tumor surroundings, whereas Dynamic Light Scattering is applied for imaging of vascular network and blood microcirculation. The obtained results demonstrate that presented multi-modal imaging approach has a great potential in vascular biology and can significantly expand the capabilities of tumor angiogenesis studies and notably contribute to the development of cancer treatment.