Tommy Au is a land surveyor indulging himself in all forms of flying activities. He had worked in the Aerial Survey Unit of the Lands Department for almost 9 years and taken more than 100,000 aerial photos in different formats and at different altitudes as official survey records. Besides fixed-wing airplane and helicopter in the office hours, he also takes aerial photos by paraglider and radio control airplane in his spare time. Recently he has just published the first aerial photo album of Hong Kong with aerial photos all taken by small format digital camera installed in an Unmanned Aerial Vehicle (UAV). The rapid development of UAV in the past 10 years has proved that UAV is a very powerful tool in different applications. UAV could serve not only military purpose but also environmental monitoring, heritage preservation, hill fire detection, search and rescue, aerial survey and so on. After the successful flight of Aerosonde across Atlantic Ocean in 1998 and granting the airworthiness certificate to Global Hawk RQ-4 by the Federal Aviation Administration (FAA) in 2003, UAV has been proved a reliable platform for conducting different types of tasks. Tommy would like to share his experience and views of the development of UAV with you in this CPD talk.