In order to complete remote sensing(RS) emergency investigation for 5.12 Wenchuan post-earthquake and secondary geological disaster, the remote sensing data sources were obtained from unmanned aerial vehicle(UAV) aerial remote sensing system, which was made up of UAV and optical RS payload. The data sources got by the high temporal and spatial resolution low latitude RS sounding, were done by a series of data processing flow such as airborne position & orientation system(POS) data treatment, orthogonal projection image making, automatic image mosaic, secondary geological disaster′s type analysis and interpretation. The image interpretation results timely show the disaster situation in the key disaster area (located in An county, Mianyang city, Sichuan province). The important information of the earthquake disaster (afflicted building, landslide and dammed lakes) includes location, boundary, scale etc.