To prepare honeycomb porous films, the pentablock copolymers were dissolved in CHCl3, CH2Cl2, C6H6 and THF, and then cast onto silicon wafer, ITO glass or stainless steel under a flow of moist air. The airflow was vertically blown over the solution surface. The solvent started to evaporate and water vapor condensed onto the solution surface simultaneously. After completely evaporating the solvent and water, the porous films were prepared. For comparison, nonporous films were also cast from CHCl3 solution of the pentablock copolymer and dried under normal conditions.