Based on reviewing the methods for UAV image-sequence reconstruction, the classification on the principle and applicability of the methods is proposed. Generally, the methods involved can be divided into two groups. One is based on traditional photogrammetry, which needs more intermediate quality-control checks and more human-computer interactions. This method can be used to reconstruct large and regular image blocks. The other called the multi-view geometry method, is more like close range photogrammetry. It is more suitable for automatic reconstruction of irregular image blocks, such as specific objects and complex terrains. After comparing applicability of different methods, the related technology is expatiated, and the advantages, limitations and enhancement methods are discussed. Finally, it is pointed out that the combination of photogrammetry and computer vision is the future research direction, and the key problems to be solved are discussed.