Many of the elderly are predisposed to develop osteoarthritis (OA), although it is quite difficult to diagnose the early-grade OA even by latest imaging modalities. In this study, we have proposed Dynamic Mechanical Analyzing Optical Coherence Straingraphy, namely DMA-OCSA, which is a tomographically micro-visualizing method of visco-elastic properties estimated from continuous OCT images. This is based on the speckle tracking algorithm having high sensitivity and S/N under micrometer resolution, thus can provide temporal and spatial distribution of not only deformation velocity but also strain rate during a dynamic visco-elasticity test. This was experimentally applied to comparatively Osteoarthritic cartilage of animal models. Consequently, the sinusoidal time-varying strain rate was locally observed to have phase difference between the superficial tangential zone and middle zone, which could cause degradation of visco-elasticity.