Core Viewpoint - The integration of rooftop greening systems with distributed photovoltaic technology is essential for improving energy efficiency, reducing carbon emissions, and enhancing urban microclimates as urbanization rates exceed 65% in China [1] Current Challenges - The complex ownership of urban rooftop spaces poses significant obstacles to project advancement, as usage rights are often dispersed among numerous owners in residential and commercial buildings [2] - Existing buildings, particularly older ones, frequently lack the necessary load-bearing capacity for integrated projects, with typical rooftop load designs ranging from 50kg/m² to 150kg/m², while integrated renovations require a minimum of 200kg/m² [2] - Distributed photovoltaic systems must meet local consumption and surplus electricity grid connection requirements, which can lead to grid backflow issues; high investment costs and long payback periods also hinder project promotion, with typical industrial projects costing around 200 yuan/m² and payback periods exceeding 10 years [3] Solutions for Advancement - To promote the integration of rooftop greening and photovoltaic systems, a collaborative approach involving policy enhancement, technological innovation, and economic incentives is necessary [4] - Institutional innovations should be implemented at the national level to clarify rooftop space ownership, establish fair usage rules, and create transparent profit-sharing mechanisms; project implementation efficiency can be improved through streamlined processes and online platforms for project registration and grid connection [4] - Standards should be developed to enhance quality and efficiency, including lightweight photovoltaic components for high-rise buildings and modular production techniques; mandatory installation of anti-backflow devices and energy quality monitoring systems is essential for grid safety [4] - Financial support should be increased, expanding the coverage of "photovoltaic loans" and allowing green electricity revenue rights as collateral; innovative business models such as energy management contracts and rooftop leasing with profit-sharing should be explored [5]