  A 325MHz beta=0.14 superconducting half wave resonator(HWR) prototype has
been developed at the Institute of High Energy Physics(IHEP), which can be
applied in continuous wave (CW) high beam proton accelerators. In this paper,
the electromagnetic (EM) design, multipacting simulation, mechanical
optimization, and fabrication are introduced in details. In vertical test at
4.2K, the cavity reached Eacc=7MV/m with Q0=1.4*10^9 and Eacc=15.9MV/m with
Q0=4.3*10^8.
