Prof. Lijing Shao obtained his PhD degree on Theoretical Physics from the School of Physics at Peking University in 2015. Then heworked as a Junior Scientist for two years in the Max Planck Institute for Gravitational Physics (also known as the Albert Einstein Institute) in Potsdam Germany. After that, Lijing worked as a Scientific Staff for one year in the Max Planck Institute for Radio Astronomy in Bonn Germany. In 2018, he joined the Kavli Institute for Astronomy and Astrophysics at Peking University as a Researcher / Assistant Professor. Lijing’s main research interests include tests of gravity theories, pulsars and neutron stars, gravitational waves, and new physics beyond the standard model of particle physics.Gravitation and spacetime are tightly related concepts in modern physics. The structure of spacetime is reflected in the dynamics of gravitation. Einstein’s general relativity has assumed a smooth, Lorentzian structure for the spacetime, which deserves close scrutiny for a deep understanding of our Universe. In astrophysics, binary pulsars and gravitational waves provide powerful means to perform relevant tests. I will talk about the recent development in using the real data from binary pulsars and gravitational waves to study the structure and dynamics of our spacetime.