In order to guarantee safe operation of marine floating nuclear power plants, human factor reliability of them is analyzed by using HCR model. Firstly, influence of external factors such as ocean microclimate, noise and hull motion on operating speed and accuracy was analyzed and quantified, and HCR model was modified. Then, with LOCA of marine floating nuclear power plants as an example, behaviors of people involved in the accident and their handling process were analyzed before values of calculation parameters were obtained according to accid...