COSINE containment analysis code for simulating the containment and relevant buildings of NPP, adopts one-dimensional and three-dimensional multiphase flow field model. It is mainly used for containment mass energy release and minimum containment pressure analysis. The containment code adopts equipment model, hydraulics phenomenon model and control system model. It can be used for calculating pressure, temperature, and hydrogen concentration in the containment. It can also simulates all kinds of equipment in the containment, such as pumps, fans, hydrogen igniter, hydrogen compound device, valves, etc. The containment code can also simulate all kinds of important phenomenon or process in containment, such as three-dimensional flow of fluid in large space, spray, condensation, liquid film evaporation, hydrogen combustion, etc.