from the provincial highway to the rural project, from the state-owned to the local supporting, from the foreign loan to the current BOT form, fundamentally solved the problem of financing, and avoided the bottleneck problem that the highway construction has become the economic development. Due to the rapid development of a large number of projects, and the lack of professionals and construction teams engaged in road and bridge construction, there are a lot of problems in the construction. The construction of any facility should start from the foundation. Therefore, the quality of subgrade construction directly affects the quality of the whole project. Next, I will talk about several problems that are often encountered in subgrade construction.