Abstract: With the deployment of IPv6 and the promotion of the 5G standardization,the next generation network has become the focus of attention of the industry.Through the analysis of next generation network (NGN) 4 layer system structure and its key technology,combined with the characteristics of our country network argues,there is still a need to go further into the next generation network.This paper gave the experience of the practice and deployment of the next generation network development,and put forward the place where it needs to break through.Combined with current technology,we gave the security problems of the next generation network and provided solutions.

Key words: Next generation network,Network architecture,Network security