With high pressure, directlyinjected engine can inject gasoline mist into the cylinder in a straight way. Thus a system or equipment, which can be used to test whether highpressure oil pipes can transport fuel to the engine satisfactorily, is necessary for safe operation of the engine. According to technical conditions of highpressure tubing assembly for diesel engine in the national industry standard JB/T 6014-2011 and quality requirements requested by the manufacturer, a test bench stressed in neutral water medium was designed for pressure test of highpressure tubing assembly, which could also load the highest output of 75 MPa. With suitable supporting jig (mould), the system could be applied to other types of mental liquid pipe, hydraulic hose and pressure vessel for performance testing of pressure, strength, sealing and so on.