As a core part of subsea production system in oil and gas field, SCM (subsea control module) is complex in design, difficult and expensive for maintenance. The failure of an SCM can cause interruption of production. It‘s essential to perform the function and performance test once manufactured and prior to delivery. Currently, there is hardly any research on the SCM FAT (factory acceptance test) on the basis of literature review. The SCM FAT includes hydraulic functional test and electric-control system test ect. Researched and concluded in this paper is based on the real experience of the deepwater gas field development project. This paper can be used as a guide for SCM for deepwater oil & gas field development project in China Sea in the future.