Interfacial polymerization was applied to the preparation of bridged organosilica membranes with bis[3-(triethoxysilyl)propyl]amine (BTESPA) and bis[3-(trimethoxysilyl)propyl]amine (BTMSPA) as monomers. The BTESPA membrane exhibited reverse osmosis (RO) with favorable water permeance (1.41 x 10(-13)m(3)/(m(2).s.Pa)) and salt rejection (93.6%), similar to those of membranes prepared by the sol-gel process. The BTMSPA membrane showed improved water permeance (3.11 x 10(-13)m(3)/(m(2).s.Pa)) and salt rejection (97.4%). The interfacial polymerization provides a much simpler method than the commonly used sol-gel process to prepare organosilica RO membrane.