In consideration of the limited construction area and thick soft silty soil，three structural schemes，i.e.，double-row interlocking piles with cement mixing piles，cantilever sheet pile with cement mixing piles，buttress structure with bored piles，are compared from the structure safety，construction difficulty，construction period，surrounding projects coordination and economic efficiency. The results show that the double-row pile structure is the best due to its adaptability to the limited construction site and thick soft silty soil，and thus may provide reference for similar river regulation projects.