With the development of 5G business, higher requirements are put forward for local transport and bearing network. The deployment of mobile bearing network based on SPN technology becomes an important means to solve the problem. This paper introduces the main bearing technology and network structure of 4G service local transmission network, as well as the difficulties faced by the existing transmission bearing network for carrying service of 5G, puts forward the application strategy of the transformation and construction scheme of 5G-oriented local transmission network, and gives a case of SPN network deployment in a city of Shandong Province.