In this study, low cost ceramic supports were prepared from kaolin via phase inversion technique with two kaolin particle sizes, which are 0.04–0.6μm (denoted as type A) and 10–15μm (denoted as type B), at different kaolin contents ranging from 14 to 39wt.%, sintered at 1200°C. The effect of kaolin particle sizes as well as kaolin contents on membrane structure, pore size distribution, porosity, mechanical strength, surface roughness and gas permeation of the support were investigated. The support was prepared using kaolin type A induced asymmetric structure by combining macroporous voids and sponge-like structure in the support with pore size of 0.38μm and 1.05μm, respectively, and exhibited ideal porosity (27.7%), great mechanical strength (98.9MPa) and excellent gas permeation. Preliminary study shows that the kaolin ceramic support in this work is potential to gas separation application at lower cost