Aiming at the water landing of amphibious aircrafts , this paper presents a fluid-structure interaction ( FSI) model of a certain amphibious aircraft head and analyzes the transient structural dynamic response of the head ditching by using the coupled Eulerian-Lagrange (CEL) method.Moreover, the stress, impact force and mass center velocity of the head at different ditching angles and vertical speeds are discussed .The results show that ( 1 ) the bottom pressure peak appears in the initial ditching stage and appears again with the heading up of the air -craft head; ( 2 ) during the ditching , the pressure of the head skeleton changes significantly; ( 3 ) with the de-crease of the hitting angle , the stress of the head reduces; and ( 4 ) both the head stress and the bottom impact force reduce with the decrease of ditching speed .%水陆两栖飞机水上降落属于复杂的流固耦合问题，文中建立了某水陆两栖飞机机头的入水流固耦合模型，采用耦合的欧拉－拉格朗日（ CEL ）算法分析了机头入水瞬时的结构动力响应，对比了不同入水角度和不同垂直速度下机头的应力、冲击力及质心速度变化。结果表明：机头入水初期船底冲击力即出现峰值，之后随着机头抬高，船底冲击力将再次出现峰值；入水过程中机头骨架受力变化明显；随着入水角度的减小，机头应力也减小；入水速度减小，机头应力和船底冲击力都随之减小。
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