Taking the Damazhou waterway as the prototype,we introduce the grass grid as a new guardian structure into the beach protection engineering.According to the characteristics flow and silt motion of Bingyin delta beach，we set up the generalized flume model to study the grass grid’s the influence on the flow structure and beach face scour prevention effect.After laying grass,the flow velocity of the beach face near bottom is decreased obviously and thus has an obvious effect of stabilizing the backfill sand and provides favorable conditions for the growth of grass vegetation.In the upstream segment of Bingyin delta beach where the face velocity is larger,it is feasible to take grass grid guard measures.