Abstract: This article took prefabricated construction as the research object, through the analysis of the relationship between the various factors, the corresponding system dynamics model was established, and took the example of Jinan city. And then, dynamic simulation of prefabricated construction development and the energy-conservation and emission-reduction(ECER) benefits under different policy scenarios was carried out. Then, the influence of changes in policy types and implementation intensity on its development trend was analyzed. The results show that, on the one hand, the efficiency of energy conservation and emission reduction of prefabricated buildings has not been fully brought into play, and strengthening policy implementation is conducive to further expanding its social and economic benefits. On the other hand, different policies have different effects on the development of prefabricated buildings and their energy conservation and emission reduction benefits. Among them, technology policy has the most significant effect. The demand policy, construction policy and fiscal policy also have obvious effects. By contrast, the role of the finance policy, tax policy and other supportive policies’ effects are relatively weak.