Taichung City Government has built “Real Taichung GIS Cloud” as a transition supply portal of GIS services, which also provides API interface directives for WMS, WFS and other geospatial data systems. Users can easily access the application procedures under a visualized graph-based window with the conceptual assistance of a shopping cart. At the mean time, we also join the alliance of GIS data warehousing administrated by Ministry of the Interior. Among all of the county/city governments, Taichung far beyond the others contributed all kinds of GIS data and services within the past 40 years which really enrich the content of TGOS data warehousing in Ministry of the Interior. Grouping supply of GIS data not only can provide advanced application and lift the usage of scarce data, but also enlarge the usage efficiency of GIS data, which dramatically cut off the cost of system regeneration. Taichung City Government is the only county/city government which ever granted the Supply System Award and Transition Service Award. Taichung had both honors in the year of 2010, 2011, and 2012.