用硝酸铝水解的溶胶凝胶法，在微滤α－A12O3支撑体上制备了超滤γ-Al2O3膜．考察了聚乙烯醇（PVA）对勃姆石胶体稳定性和膜制备的影响用扫描电镜、气体和液体渗透和截留分子量等实验方法，对所制备的不对称膜进行了表征在典型条件下，用该法制备的陶瓷膜的Kelvin半径约为4．8nm，其分离率为90％的截留分子量约为4000硝酸铝可以代替醇铝用于制备氧化铝超滤膜. An ultrafiltration γ-Al2O3 membrane was prepared on the microfiltration α-A12O3 support by sol-gel method with aluminum nitrate hydrolysis. The effects of polyvinyl alcohol (PVA) on the stability and membrane preparation of boehmite colloids were investigated. The asymmetric membranes were characterized by SEM, gas and liquid permeation and molecular weight cutoff. Under typical conditions, The ceramic membrane prepared by the method has a Kelvin radius of about 4.8 nm and a molecular weight cut-off of 90% with a cut-off molecular weight of about 4000. Aluminum nitrate can be used instead of aluminum alcoholate for preparing an alumina ultrafiltration membrane.