Next generation network(NGN) is a type of network which can provide audio，data and video among telecommunication network，computer network and CATV network. The coming of NGN has become an important milestone of the development of telecommunication network. The situation of next generation network is outlined. The conception of NGN and its key technologies are presented. The impact of software development platform upon NGN at next stage is redirected. Finally，the new trend and characters of software development platform is summarized，which is under new internet condition