Abstract: With the implementation of China′s “Dual Carbon” strategy, distributed power, especially distributed photovoltaics, is experiencing a surge in growth.The unregulated, large-scale integration of distributed photovoltaics has caused problems such as overvoltage and reverse equipment overload in some distribution grids, hindering the orderly and sustainable development of distributed photovoltaics.This paper proposes a swift calculation method to compute the permissible capacity of distributed photovoltaics for power distribution equipment and administrative regions.This method considers various constraint indicators of the distribution equipment and system, balancing computational accuracy and efficiency.Under the precondition of ensuring the secure, reliable, and economical operation of the distribution network, it scientifically ascertains the maximum capacity of distributed photovoltaic capacity that the network can sustain, providing a foundation for the organized integration and robust development of distributed photovoltaics.Finally, the method′s scientific reliability and practical feasibility are corroborated through a county-level case study.