低序次断裂是地壳变形的直接产物，具有丰富的构造变形信息，经过转换的低序次构造。形式多样，图案复杂，是构造研究的重要对象，也是地表稳定性研究的重要基础。利用香港地区航空雷达图像资料，提取其中低序次构造的弱信息，建立转换变形模型，以分析区内不稳定地表的构造背景。区内北东向断裂是主要构造，其右行剪切形成一系列低序次R面，P面，R^1面构造，在雷达图像上表现为线性弱信息并且与微地貌发育有关。利用线性构造增强，提取技术和低序次构造组合分析方法，结合野外地质调查，确定马鞍山地区EW向的张性破裂是NE向张剪断裂的转换，是造成马鞍山滑坡的重要地质因素。

Subordinate fault is the direct production of crust deformation, It has rich information of structure deformation . The forming and evolution of subordinate fault can lead to break up of the rocks and speed up the weathering of the rocks. Transformed subordinate faults have many types and are of complex patterns, they are important subject of structure study, and also they are the important study base of ground surface stability. In this paper, we use the airborne L-SAR image of Hong Kong, and select the weak-information of subordinate faults by processing the image, set up the model of transform deformation, in order to analyze the structure background of unstability ground surface of study area. The NE faults are the main faults in study area, their dextral movement formed a series of subordinate shear plane R , P, R' and related transformed faults. They are represented as weak information of lineation in radar image and related to the development of micro-geography. By selecting and enhancing the weak information, we made the deformation frame of subordinate faults. Together with field investigation, we found that there are EW and NEE trans-tension faults in Ma-An-Shan area, and the EW faults are the transformed faults of NEE faults. Most of these faults are related to the landslide, and are the main geological factors of Ma-An-Shan landslide.