The ecological bank revetment using the sash structure to stabilize the soil is a new trend of bank revetment projects.The ability of the sash to stabilize the soil is a key part of the success of the ecological bank revetment construction.This paper introduces the multi-grid block,a new type of eco-revetment hexagonal block,and studies the erosion depth of the sediment inside the block cavity after wave action through indoor water tank experiments.The test results show that the depth of sediment erosion in the multi-grid block on the slope embankment follows the rule of increasing and then decreasing from top to bottom along the embankment.At the same time,the depth of sediment erosion will increase as the wave height increases.And the depth of sediment erosion in different parts of a single block is different.Changing the type of sediment filled in the block cavity will affect the depth of erosion but not the overall law of erosion on the slope.Compared with the frame grill fence board,the multi-grid block has a better sand-fixing effect,and can provide a good growth environment for plant revetments.