Failure of high-power AC/DC tie-line will lead to large-scale power loss in the receiving-end power grid, and a part of the provincial units are dispatched by the provincial power grid (P-Units), the other part is dispatched by the regional grid (R-Units). In view of the above problems, the coordinated adjustment strategy of real-time generation plan for regional and provincial dispatching units is studied. Firstly, the models for the allocation of active power adjustment and output tracking between P-Units and R-Units are constructed. For the cases that P-Units or R-Units might not be able to track the allocated active power adjustment, a coordination strategy for active power of P-Units and R-Units is proposed, followed by an output correction model. Together, a set of real-time scheduling methods coordinated P-Units and R-Units which are suitable for provincial power grid under large power loss are formed. Simulation result shows that compared with conventional real-time scheduling method, the proposed method is conducive to fast recovery of provincial grid active power balance after large-scale power loss. This work is supported by Science & Technology Project of State Grid Corporation of China (No. 5442dz180019) “Research and Application of Core Technology in Global Planning Decision and Spot Market” .