The fixtures are work holding device used to locate and fix the position of work pieces for machining, assembly, inspection, and other operation. A fixture consists of a set of clamps and locators. Locators are used to determine the orientation and position of a workpiece, and clamps exert clamping forces on the workpiece so that the workpiece is pressed against locators and resting pads. The recent trends in industry are towards adopting the hydraulic and pneumatic techniques, because it save time generates accuracy and it is having some flexibility.The hydraulic fixture is designed for gear housing to perform "drilling and boring" operations using Vertical machining centers(VMC). Computer aided fixture design of fixture assembly is carried out using Solid Works software.