澜沧江中游平坡村发育的古滑坡如何受断层控制及其对河道变迁影响关系到跨越该河段桥址和结构选用。尽管断层对滑坡控制作用已知，然其剖面变化及河床形态并不清楚。通过布设横穿河道总长3.36 km高密度电法和大地电磁法剖面，探测了地质结构及沉积物随深度及其横穿河谷变化。结果发现左右两岸断层空间分布及其对河道向东突弯、滑坡斜向对岸滑动残留体的内部结构特征及其临江侧缘凸出的基岩，以及现代河床堆积物上游比下游厚度大、右岸比左岸大等受古滑坡向东滑移且无下伏控制性断裂等特点。跨河钻孔所揭露地质条件与物探结果一致，进一步验证了古滑坡发生对平坡段河道东移350 m及其箱型河底和两岸堆积物厚度变化的影响。与1985年卫星遥感影响对比发现最后一次滑坡是斜向澜沧江上游的NNE方向而不是以前认为的两并列滑坡。研究结果对认识受断层构造控制和古滑坡推挤影响的河道东向突变及沿江古滑坡特征可提供参考，为沿江工程选址提供技术支撑。

How the ancient landslide developed in Pingpo Village in the middle reaches of the Lancang River (LR) is controlled by faults and its impact on river channel changes is related to the selection of major bridge sites and engineering structures crossing the river section. Although the controlling effect of faults on landslides is well known, their profile changes and the impact on the eastward migration of the Lancang River's curved channel are not clear. On the basis of previous research, the geological structure and its sediment changed with depth and crossing river valleys were explored by deploying high-density electrical methods and magnetotelluric profiles that span a total length of 3.36 km across the river channel. The results showed the spatial distribution of faults on both sides of the river, their impact on the eastward bending of the river channel, the structural characteristics of residual landslide, changes in buried ancient river channels, and the characteristics of modern riverbed deposits such as thicker upstream than downstream and larger on the right bank than on the left bank, which were affected by the NNE sliding of ancient landslides without underlying controlling faults. The geological conditions revealed by the four boreholes crossing the river are consistent with the geophysical results, further verifying the impact of ancient landslides on the eastward movement of the Pingpo section of the river by 350 m and the thickness changes of the box shaped riverbed and sediment on both sides. The internal structural characteristics of the residual body of the landslide are sliding diagonally towards the opposite bank and the protruding bedrock on the riverfront edge. Compared with the satellite remote sensing impact in 1985, the latest landslide was found to be inclined towards the NNE direction of the upper reaches of the LR, rather than two parallel landslides as previously stated. The research results provide a reference for understanding the abrupt changes in river direction controlled by fault structures and the influence of ancient landslide pushing, as well as the development characteristics of ancient landslides along the river, which playing roles for bridge sitting and engineering structure selection.