The self-design and improved pressurized water reactor (PWR) of CPR1000 is used in Yangjiang nuclear power plant (NPP) with two-reactor layout design. The modular method is applied in the construction of containment’s steel lining in No.3 unit, in order to shorten the construction period of cylindrical containment covered with steel lining. This paper introduced the design and construction scheme of modular construction for the steel lining, and put forward suggestions for the modular design and construction, which could provide references for the related projects.