Qin, B. Chen, Q.S. Chen, W. Fan, K. Fan, M. Liang, Z.K. Liu, K.F. Liu, X. Tan, P. Yu, T. JACoW Geneva, Switzerland 978-3-95450-167-0 10.18429/JACoW-Cyclotrons2016-MOP12 English 79-82 MOP12 proton cyclotron dipole emittance radiation Contribution to a conference proceedings 2017 2017-01 http://dx.doi.org/10.18429/JACoW-Cyclotrons2016-MOP12 http://jacow.org/cyclotrons2016/papers/mop12.pdf Proton therapy is recognized as one of the most effec-tive radiation therapy method for cancers. The super-conducting cyclotron becomes an optimum choice for delivering high quality CW proton beam with features including compactness, low power consuming and higher extraction efficiency. This paper introduces de-sign considerations of the beamline with fast scanning features for proton therapy system based on supercon-ducting cyclotrons. The beam optics, the energy selec-tion system (ESS) and the gantry beamline will be de-scribed.