The crustal deformation is attributed to tectonic processes occurred in the Earth. Data of geodetic measurements are used to clarify these processes and their mechanisms. Thanks to space geodetic techniques (i.e., GNSS and InSAR) developed in recent three decades, high resolution geodetic data in time and space enabled us to deepen our understanding of plate tectonics, earthquake, volcanic eruption, subsurface rheological structure and so on. In this talk, I briefly review some geodetic studies in Japan. Introduction of two topics on slow earthquakes and deformation paradox with geodetic and geological time scales are also included.