Abstract: According to the dificult start, unbalanced multi motor driving power and other problems existed in a driving system of the scraper conveyor, a soft start system with a valve controlled flling type hydraulic coupling was researched and developed. The paper introduced the composition, working principle and key technolog y of the soft start system with the valve controlled flling type hydraulic coupling. A flow field simulation technology was applied to the design of the impeller chamber mo de, structure and strength and a high strength copper alloy impeller was successully researched and developed. Based on a magnetic suspension technology, a floatin g support structure of the pump wheel component and a worm wheel support structure were designed and a reliability of the matching electric motor and the speed redu cerDs bearing was improved. A scale inhibiter was set up in a water supply circulated loop to eliminate a coupling operation fault caused by the water scale and to impr ove the reliability of the coupling operation. With a design on a supply water sealing, an overilling phenomenon occurred in the operation process of the coupling was C ompletely eliminated. A segmented vertical type combined control valve and water supply system could be applied to realize a selection of an open or close operation fo r the coupling. The reliable performances of the coupling were approved by the lab experiment and industrial experiment.