Porous calcium hexa-aluminate (CA(6)) ceramics were in-situ synthesized by heated CaCO3 and -Al2O3 in a NaCl-based salt at 1400 degrees C for 3h, and then characterized by X-ray diffraction (XRD), scanning electron microscopy, (SEM) and mercury porosimetry. The size and morphology of the CA(6) crystals and pores were gradually changed with the increase of NaCl addition in the raw material, indicating that the molten salt not only provided a liquid environment for synthesis of CA(6), but also generated considerable pores.