In view of the characteristics of the prefabricated residential buildings that are different from those of traditional ones, the prefabricated housing modes are generally sorted out in present study based on the principle of efficient solar energy utilization. This paper selects the green residential buildings with evaluation mark in Jiangsu coastal areas as the research object to carry out an in-depth analysis on the main influencing factors of energy saving and emission reduction effects of prefabricated residential buildings, on the energy-saving effects of the three most commonly used residential green technologies, including natural ventilation, natural lighting, as well as solar hot water system, and on the economic efficiency of these three technologies through numerical simulation method. In addition, the results of simulation are also comprehensively evaluated in the paper. The results show that green residential buildings that adopt passive technologies and solar hot water system have greater energy saving potential, and thus can achieve a significant economic return. Prefabricated green buildings can be a building mode with high cost and high returns.