We found a Higgs boson and are learning more its properties with collision data from the Large Hadron Collider (LHC) and its future upgrade HL-LHC. But to unveil the fundamental nature of this particle and to explore potential new physics, we would need high energy electron positron colliders with high luminosity. In this talk, I will introduce such an initiative from China, the Circular Electron Positron Collider (CEPC). I will discuss its science case, the conceptual design, and the status and prospects of the project.