According to practical needs of group collaborative decision making problems in network era and based on application features of group network planning technology, the method of group task planning based on network center is proposed, which achieves the decomposition of decision task and solving process of cooperation by group decision makers. Meanwhile, the interactive and collaborative decision making framework based on Network Center is constructed, and the decision model integrated by sub task solving and task plan is analyzed. At last, the overall design scheme of interactive and collaborative decision making support system based on network center is presented. The decision making framework and support system design embodies the characteristics of the group task planning and interactive collaboration, which has a good application prospect in the development and deployment of the network centric decision support system in the future.