The production capacity is one of the key indicators reflecting the factory producing prefabricated components, and the production arrangement mode of the components will have direct effects on the production efficiency and capability of prefabricated components. This paper applies the simulation experiment using Anylogic for the better automatized external wall prefabrication line, to analyze and calculate the productivity of PC components under the free-beat and fixed-beat production arrangement modes, respectively, and to discuss the applicable conditions for different production arrangement modes.