Cui, X. Yu, C.H. Zhai, J.Y. Zhang, Y. JACoW Publishing Geneva, Switzerland 978-3-95450-216-5 10.18429/JACoW-eeFACT2018-TUPAB05 English 143-145 TUPAB05 injection booster collider dynamic-aperture damping Contribution to a conference proceedings 2019 2019-04 https://doi.org/10.18429/JACoW-eeFACT2018-TUPAB05 http://jacow.org/eefact2018/papers/tupab05.pdf Considering the requirement on the dynamic aperture in the main collider, an on-axis injection method is need-ed for the Higgs energy at CEPC. A swap-out on-axis injection scheme using the booster as an accumulation ring is given in this paper. Some dynamical problems concerning the effectiveness of this injection scheme is also discussed.