As a membrane material, poly(m-phenylene isophthalamide) was prepared by low-temperature solution polycondensation. The ultrafiltration measurement and dialyssis test were performed to study the transport properties of the aromatic polyamide membranes. The effects of the drying temperature, addition of inorganic salts(LiCl, CaCl₂) and the precipitation medium on the membrane performance and morphology were also investigated. In ultrafiltration measurement, the water flux was determined with an Amicon Model 8050 Ultrafiltration cell. In dialysis test, the permeability coefficients of urea, ethylene glycol and polyethylene glycol through aromatic polyamide membranes and a commercial cuprophane membrane were determined using a continuous flow diaysis apparatus. The morphology of aromatic polyamide membranes was investigated with the aid of the scanning electron microscope (SEM).