ABSTRACT:Muti-baseLine SAR tomography can be used on 3D reconstruction of urban building based on SAR images acquired. In the near future, it is expected to become an important technical tool for urban multi-dimensional precision monitoring. For the moment，There is no effective method to verify the accuracy of tomographic SAR 3D point cloud of urban buildings. In this paper, a new method based on terrestrial Lidar 3D point cloud data to verify the accuracy of the tomographic SAR 3D point cloud data is proposed, 3D point cloud of two can be segmented into different facadeds. Then facet boundary extraction is carried out one by one, to evaluate the accuracy of tomographic SAR 3D point cloud of urban buildings. The experience select data of Pangu Plaza to analyze and compare, the result of experience show that the proposed method that evaluating the accuracy of tomographic SAR 3D point clou of urban building based on lidar 3D point cloud is validity and applicability b Corresponding author Pang Lei ,email address , panglei@bucea.edu.cn At the end of twentieth Century, tomography technology is introduced in synthetic aperture radar ， and produce the Tomographic SAR. Compared with the traditional SAR imaging technology, Tomography SAR imaging technology as a three-dimensional high-resolution SAR imaging system in addition to the range and azimuth to have a higher resolution， while increasing the ability to distinguish in elevation. It really achieved the three-dimensional imaging of the target, in recent years it's more and more attractive for many domestic and foreign research institutions and researchers. Three-dimensional reconstruction by the SAR will inevitably produce some errors, the error mainly includes time coherence error, SNR error, polarization error, atmospheric phase difference, etc. The influence of these factors is reflected in the accuracy of the point cloud data. The accuracy of the analytical SAR point cloud assessment mainly refers to the evaluation of plane accuracy and elevation accuracy, also known as the positioning accuracy evaluation. The accuracy of the SAR data is critical to the subsequent data processing and quality of the results. The terrestrial lidar is a set of global navigation system, inertial navigation system and lidar scanner in one for three-dimensional information remote sensing system. lidar as a new means of information access, it has a high point cloud density, fast efficiency, little impact by the weather, high data accuracy, rich product advantages, etc [1] . So the using of the current relatively mature LIDAR technology can be very good to verify the accuracy of the tomographic SAR.