Solar energy technologies include solar photovoltaic technology and solar optothermal technology. The use of solar energy does not produce pollution to environment, and it can be obtained permanently, so the solar energy light heat utilization will become one of world's largest projects in energy saving and carbon reduction. The civil engineering solar energy use and promotion in our country have many problems. The market for optothermal products of solar energy is in disorder competition. There are some hinders of technology, management and legal aspects in community residents installing solar optothermal products. It is suggested that local government sets down relevant energy-saving mandatory policies and technical specification, such as making mandatory policies of solar thermal utilization for civil construction and technical specifications for solar building integration, clarifying building roof property, establishing government subsidies system and setting up a professional steering committee for the solar energy optothermal utilization, so as to achieve energy saving and emission reduction and promote the development of low carbon economic.