In this paper, wholly aromatic polyamide has been synthesised from complex amine, 1,3-bis(3-amino benzamido)benzene or preformed amine (PFA), aromatic diamion carboxylic acid and aromatic dicarboxylic acid chloride. The synthesised polyamide, has functional amino and carboxyl groups. The polymer has been characterised by using IR and H-1 NMR. The membrane porosity has been determined by SEM. The evaluation of membrane has been done by using ＇＇Reverse Osmosis Test Cell＇＇ (Osmonics). The salt rejection (efficiency) and product water output rate (flux) have also been determined for different membranes with LiNO3/LiCl combinations.