Abstract: After analyzing current status of network convergence of China,a convergence policy of network convergence was presented, and then the network convergence architecture based on common IMS technology was proposed, and its main entity functions and control procedures was described. Under the case that the proposed architecture, each net- work's management and main technology are not changed, each network shares all users' information and network re- sources, and end-users can choose different networks and services according to their own needs, and thus network con- vergence is realized.

Key words: Network convergence, Common IMS(IP Multimedia Subsystem) , Architecture, Policy