Ma, Y.S. JACoW Publishing Geneva, Switzerland Circular Electron Positron Collider (CEPC) is an e⁺e⁻ Higgs factory aimed at producing Higgs/W/Z bosons and top quarks, with the goal of discovering new physics beyond the Standard Model. The CEPC project was proposed in 2012, shortly after the discovery of the Higgs boson. The vacuum system of CEPC accelerator includes the LINAC, Booster, collider rings, and MDI (Machine Detector Interface). The Conceptual Design Report (CDR) was published in 2018, and the Technical Design Report (TDR) is expected to be published in the coming weeks. In terms of vacuum technology, RF shielding bellows, extruded copper and aluminum vacuum pipes have been designed and carried out. NEG coating of 200nm is employed to suppress e-cloud of positron ring and absorb residual gases for both e⁺,e⁻ rings, simultaneously.