[en] R and D work of a super-conducting proton linac has been continued since 1995 in JAERI for the neutron science project and the current KEK/JAERI high intensity proton accelerator project. In the cavity development work, we obtained good performance, high field and high quality factor. As the next step of the R and D, a prototype cryo-module was fabricated. The cooling and high power RF tests of the cryo-module were performed successfully. The RF test is being continued to obtain stable accelerating field in the pulsed operation. In the high intensity proton accelerator project, the super-conducting linac is planned in the energy region from 400 to 600 MeV and the beams will be delivered towards the transmutation experimental facility (TEF). TEF consists of two facilities; the transmutation physics experimental facility (TEF-P) and the target test facility (TEF-T). This paper provides the R and D status of super-conducting proton linac and the high intensity proton accelerator project concerning the super-conducting linac and TEF. (author)