Bank collapse occurs frequently in the middle and lower reaches of the Yangtze river, so revetments are arranged to protect slopes and prevent the bank from falling at this stage. To search an effective and economic layout of revetments in the regions where bank collapse occurs frequently，we use tests to analyze protecting results of different heights and different structures of revetments in ideal trapezoidal and straight river. The test shows that row bank revetments are more conducive to long-term stability if it is single arranged，but we should pay attention to the phenomenon of slope break point; revetments arranged in the upper regions of slopes get better effects in the limited time; with the width of revetments increased，effects are more obvious; from the effectiveness and economy, revetments arranged in the upper regions of slopes around 2 h 3 height are more reasonable.