Liu, H.C. Chen, Q. Fan, M.X. Fu, S. Gong, K.Y. Li, A.H. Li, B. Peng, J. Qu, P.H. Wang, Y. Wu, X.L. JACoW Publishing Geneva, Switzerland 2226-0366 978-3-95450-194-6 10.18429/JACoW-LINAC2018-THPO030 English 744-746 THPO030 DTL MMI operation linac vacuum Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-LINAC2018-THPO030 http://jacow.org/linac2018/papers/thpo030.pdf The China Spallation Neutron Source (CSNS) Drift tube linac (DTL) accelerates H⁻ beam from 3 to 80MeV with 4 independent tanks. The 80MeV beam acceleration was achieved in January 2018. The linac is a key to the reliability of the whole CSNS facility since all the beams stop when these upstream facilities fail. Many efforts have been made for DTL reliable operation. This paper presents the operation experience learned in DTL com-missioning.