Wang, Y. Chen, Q. Fan, M.X. Gong, K.Y. Li, A.H. Li, B. Liu, H.C. Peng, J. Qu, P.H. Wu, X.L. JACoW Publishing Geneva, Switzerland 2226-0366 978-3-95450-194-6 10.18429/JACoW-LINAC2018-THPO031 English 747-749 THPO031 DTL cavity vacuum operation MMI Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-LINAC2018-THPO031 http://jacow.org/linac2018/papers/thpo031.pdf The high power RF conditioning of CSNS DTL was finished in April 2017 with peak input power 1.6MW, 650us pulse width, 25Hz repetition frequency. With careful tuning of RF amplitude and phase, beam was accelerated to 80MeV successfully with maximum peak beam current 12mA and about 98% transmission efficiency. DTL operate stably at full power level with several trips per day without beam interruption after six months commissioning. The whole RF conditioning process was presented and some details of beam commissioning were described in this paper.