Tide embankment of south seawall for Yellow River is located in Yellow River Delta. It is not suitable to utilize the
ordinary armor blocks within high porosity and riprap protection because of lack of stones and flat terrain. The concrete flat plate
and Tianlong plate are proposed in the present paper, the stability of armor blocks under the critical incident wave conditions
within various cases using physical modeling experiments. Tianlong plate has small weightness and good integrity, which has
good capability on wave absorbing. Therefore, Tianlong plate is suitable for tide embankment of south seawall for Yellow River as
the armor blocks.