With the development of surveying and mapping technology, it has become a tendency of modern surveying and mapping technology to use airborne 3D laser scanner to obtain point cloud data, and extract the model information from the point cloud data. Relevant applications of point cloud data processing are also increased quickly, but the point cloud data processing softwares are uneven, and the demand and functions are different as well. In view of the above problems, using PCL to develop the 3D laser scanner point cloud data processing software based on the QT programming platform, the dissertation focuses on processing point cloud data in a software system. The system is composed of point cloud data reading and writing module, three-dimensional display module, point cloud filtering module, mesh reconstruction module, point picking, point cloud segmentation and NARF key points extraction functions. Each module uses the object-oriented thought, in which the function is easy to expand to complete further surveying and mapping work. Practice shows that the system has good engineering practical value and can quickly complete the data processing of airborne 3D laser scanner.