We are embracing the new era of the Cosmic Microwave Background research, aiming to probe the Primordial Gravitational Waves (PGWs) originated from the very early Universe. Recently, the Ali CMB Polarization Telescope (AliCPT) has been launched in Tibetan Plateau of China to measure the CMB B-mode polarization in northern hemisphere. This symposium brings together experimental and theoretical scientists that are interested in this project and the related cosmological topics. The program consists of plenary sessions with presentations covering, but not being limited to, the following topics: