In construction project, the main contractor will hire sub-contractor to perform some parts of the project. The sub-contractor play important role in the construction project. They can make the good and bad benefits for the main contractor. Although the main contractor can allocate some risk of their work to the sub-contractor, they have to face a lot of problem that is related to the sub-contractor such as responsibility and bad performance. Those problems impact to the construction project. Therefore, we need to identify the critical risks that may be occurred and suggest some risk response to deal with it.