Abstract: This paper presents a wind power integrated grid cascade fault prevention strategy that considers vulnerable branch screening, targeting the cascade fault phenomenon caused by branch faults in wind power systems. Firstly, a branch trip probability model and system safety indicators are constructed. Probability density functions and normal distribution functions are introduced to assess the vulnerability of various branches in the wind power system, thereby the serious initial fault branches are screened. Then, based on the vulnerability ranking of branches, one or several branches with serious impacts on grid operational safety are selected, and the expected accident set is established. Finally, a cascade fault prevention and control model is developed, which takes into account both system safety indicators and prioritized wind power absorption. The model is solved using a particle swarm optimization algorithm.The simulation analysis is conducted based on IEEE-14 and IEEE-39 node systems, and the results indicate that the proposed wind power integrated grid cascade fault prevention strategy, considering vulnerable branches, not only prioritizes wind power absorption but also ensures a sufficient security margin for the wind power system.