Wang, M.W. Guan, X. Huang, W.-H. Qiu, M.T. Wang, D. Wang, X.W. Wang, Z.M. Wei, C.Y. Xing, Q.Z. Zheng, S.X. JACoW Publishing Geneva, Switzerland 978-3-95450-201-1 10.18429/JACoW-IBIC2018-WEPC09 English 509-511 WEPC09 emittance rfq linac proton space-charge Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-IBIC2018-WEPC09 http://jacow.org/ibic2018/papers/wepc09.pdf Xi’an Proton Application Facility (XiPAF) is composed of a linac injector, a 230-MeV synchrotron and a high energy transport line. To study the beam dynamics along beamline, a double-slit emittance meter is used to measure beam phase space in the linac. To have knowledge of phase space upstream of the emittance meter, an inverse transport method is proposed in the presence of space charge. The design and preliminary test results of the emittance meter are shown in this paper.