GDSS has great difference w ith t radit ional DSS on wo rk ing style and arch itectu re. In the netwo rk environm en t, decision in o rgan izat ion needs a k ind of open GDSS arch itectu re and cooperat ion wo rk ing style. Th is paper p resen t s a new GDSS arch itectu re based on MA S and a cooperat ion decision model under the arch itectu re. Based on arch itectu re, w e develop a p ro to type of GDSS and f igu re ou t the direct ion of research in the fu tu re.