The history and the fecture of MICAPS, the implementation and architecture, and key technology of new version MICAPS (the Meteorological Information Comprehensive Analysis and Processing System) V3 are introduced, and the main functions and corealgorithm of MICAPS V3 are also presented. The open architecture is used in MICAPS version 3.0. The flexible basic framework is charged with main window, map projections, layer control etc., and the functions are implemented by extended modules. Therefore this architecture can support the extended development by local WFOs (Weather Forecast Offices). All kinds of data specified by MICAPS versions 1 and 2 can be redisplayed in MICAPS version 3. This new version software can additionally display CINRAD level Ⅱ and level Ⅲ data, GPF and AWX format meteorological satellite data, GPS/MET data, AMDAR data, and wind profiler data. It has five data searching modes: filename searching, parameter searching, composite chart file searching, menu searching and scrolling page searching. It provides accumulated precipitation calculation, weather consultation, and history data searching function.