Abstract: Considering the demands for precise spatial relationships and effective 3Dvisualization in 3Dplanning approval,two solutions of rapid and mass building roof texture generation is presented inthis paper.In the first solution,the correspondence of object space and image space is built based onthe collinearity equation of perspective projection,then,the best roof texture for texture mapping canbe selected considering the optical axis direction,occlusion relation and image resolution.In the sec-ond solution,the roof texture database is built and used to synthesize roof texture with the smartmatching technology.The experimental results with the 3Dcity models of Changzhou demonstratethat two sets of solutions for roof texture generation can meet the requirements of rapidly reconstruc-ting texture of building.