在新生代青藏高原隆升过程中，印度板块与欧亚板块碰撞挤压导致陆壳块体沿藏东南大型走滑断裂侧向挤出，该“碰撞挤出”模式合理地解释了三江地区新生代强烈的走滑活动。但是对三江地区复杂的逆冲褶皱变形、多期构造变形叠加方式及浅层构造变形的动力学机制还缺乏相应研究。通过考察横穿三江地区盆山单元的地质剖面，将该区浅层构造变形划分为挤压和剪切2种力学类型，并对各种变形特征进行分期、配套，得到印支期以来的叠加过程，从而探讨其动力学机制的转换，并提出新生代后期遍布全区的小型走滑断裂的运动学模型。

During the uplift of Tibetan plateau, the collision of Indian plate and Europe-Asian plate led to continental crust blocks' extrusion along large-scale strike-slip faults. We used the model of collision extrusion to reasonably explain the Cenozoic intensive strike-slip active. But it was paid less attention to the study of complex thrust-folding deformations，multi-phase structural deformational overlay pattern and dynamical mechanism of shallow structural deformation. After investigating the transverse section through the basin-orogen units, we divided shallow structural deformation of Sanjiang region into extruding and shearing mechanical types, and found out the time and form for the different structural deformation. Then the folding history was gotten after Indo-China epoch era. Finally, we proved the conversion of dynamical mechanisms and put forward the kinematical model of small-size strike-slip faults which distribute the whole area in late Cenozoic.