Abstract: GeoVideo,the video with geographic description,is a new approach to the geo-spatial representation.While VideoGIS is the information system to collect,manage,distribute and utilize the GeoVideo resources.We aim to design and implement a Web service-based VideoGIS using Abode Flex.These types of web services,i.e.web mapping services,web video services and geographic XML services,were mashuped in rich Internet application.The key techniques of VideoGIS system design include GeoVideo data collection and geographic descriprion,costribution of web services,and system integration in Flex Builder.Video location and semantic descriptions were edited in XML document and the video paths were created in map layer with multiple video metadata.video service and mapping services were published using Adobe FMS and ArcGIS server,and the XML documents were stored in IIS virtural directory.In Flex Builder,Geovideo player was designed using VideoDisplay Control,and the map operations were implemented using ArcGIS Server Flex API.The system development shows that VideoGIS design and implmentation in Flex are simple and efficient,and the interfaces are dynamic and effective.We believe that VideoGIS has application potentials in facility management,geographic education,tourism promotion and other fields.