Leaning revetment is a common type of seawall structure. In common cases, armor blocks and foot protections are placed in front of their lower part. Main purpose of the blocks is to prevent rubble foundation sucking away in high wave condition. However, previous study indicates that these blocks prevent sudden displacement of leaning revetments. In this study, experiments were conducted to measure effect of the blocks to prevent leaning revetments' displacement. The result of the experiments indicated that these blocks have functions: they help to increase stability of leaning revetment's structure including rubble backing if the blocks have abundant weights, they could be evaluated in calculation of stability of leaning revetments, offshore direction force which they receive by a leaning revetment may change under their placed condition.