This paper puts forward a new grass mat structure after analysis of the insufficient of tradition erosion control structure of beach protection engineering edge.The paper carries out fixed bed and moving bed model tests to study the effects of different flattening degree,different layout and different current velocity on scour prevention.The results show that when current velocity is small,blade bending amplitude is small.Current velocity increases to 0.3 m/s,and blade bending amplitude is large.While current velocity increases to 0.73 m/s,blade bending amplitude increases lessly.When blade flattening degree is 60°,scour prevention effect of sparse arrangement mode is better.When it is 75°,scour prevention effect of close arrangement mode is better.However,when the current velocity is large,the erosion protection effect of grass mat will be less.Based on the researches,the paper determines the grass mat structure.