As a pilot company in state-owned assets operation appointed by SASAC, SDIC plays its unique role originating from the nature of being a state investment holding company in optimizing the structure of state sector of the economy. Currently, four companies have been merged into SDIC. They are China National Investment & Guaranty Co.,Ltd., China SDIC International Trade Co.,Ltd., China Electronics Engineering Design Institute and China National Complete Plant Import & Export Corporation (Group). And SDIC is implementing trusteeship of China Gaoxin Investment Group Corporation.