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With the emergence of LIDAR technology, three-dimensional building extraction has also been more and more attention. LIDAR data distribution as a result of non-continuity and regularity, directly from the location of airborne laser scanning data extraction more difficult to carry out the building. In this paper, a combination of gray-scale image of the LIDAR data extraction method of three-dimensional buildings, divided into three steps: First of all buildings on the two-dimensional gray-scale image extraction then processed LIDAR data images and rough match, LIDAR data to determine the initial three-dimensional buildings in the region the final threshold of use of a group of operations extract accurate three-dimensional structures. The experimental results show that the method is simple and practical, adaptable.