Hao, J.K. Chen, J.E. Feng, L.W. Lin, L. Liu, K.X. Quan, S.W. Wang, F. Xie, H.M. Zhu, F. JACoW Geneva, Switzerland 978-3-95450-191-5 10.18429/JACoW-SRF2017-THXA04 English 700-702 THXA04 cavity ion SRF superconducting-cavity FEL Contribution to a conference proceedings 2018 2018-01 https://doi.org/10.18429/JACoW-SRF2017-THXA04 http://jacow.org/srf2017/papers/thxa04.pdf Development of SRF technology has been included in the project of Soft X-ray FEL (SXFEL) for a hard X-ray FEL plan in China which would be operated in CW mode. Six 9-cell TESLA type cavities as well as several single-cell cavities made of Ningxia large grain niobium material have been fabricated by Peking University for achieving high gradient and high intrinsic quality factor Q0. The measurements of gradient and Q0 have been carried out with a new vertical test system at PKU. The process of fabrication, surface treatment and test results of these large grain cavities will be presented.