Based on the characteristics of hydrology-sediment movement,bed material component,and ecological environment situation in the Yangtze River below Nanjing,the trellised gravel cage structure,three-dimensional network structure and ecological soft mattress were developed to protect river bank for tidal level changing zone,and for high level beach,geo-grid plus cruciform ballast structure and compartment geo-membrane concrete structure were studied.Also,geo-mattress,active ground consolidators and twisted double ‘H’permeable frame structure were studied for low level beach protection.As for ecological dam body,two types of semicircle component and trapezoidal component were designed.The mechanism of these ecological structures mentioned above had been analyzed.Therefore,they were applied in both the first phase and second phase of the 12.5 meters water depth navigation channel regulation project which have presented significant economic and ecological benefits,and could be extended to similar projects widely.