The skid mounted truck loading and unloading systems is Custody Transfer Systems for Gasoline, diesel, LPG,bio-fuels and chemicals. The skid-mounted loading station integrates the instruments and equipments in each loading position into a special frame structure. The framework of the loading system adopts the distributed control and centralized management mode, which is the most advanced loading control system and loading management system. The system is divided into three layers: field instrument, network communication and upper computer management. The skid-mounted loading station is equipped with instruments and equipments at factory. The electrical connection, system strength and air tightness test, system function test, recording test data, and the system test are qualified before leaving the factory. After delivering to loading site, the skid system can be directly put into use through simple commissioning after connecting the anchor bolt, the process pipeline, the power supply line and the communication line.