Abstract: In recent years, assembled buildings has ushered in explosive development, one is due to the innovation of assembly technology, the other is the strong support from the national policy. most areas of China have launched the relevant policies of prefabricated buildings to encourage the development of prefabricated buildings. Correspondingly, most regions of China have issued the evaluation standards of prefabricated buildings according to its own charateristics. The prefabrication ratio is the most important part. In this condition, PKPM-PC has launched the prefabrication ratio calculation function which adapts to the local policies.