Abstract: Under the new type of power system with a high proportion of inverter-interfaced distributed generator（IIDG） access,the fault current shows a nonlinear variation. The traditional adaptive protection scheme is difficult to adapt to this feature, and its adjustment is based on a fixed operation mode without considering the change of topological structure. For this reason, an improved current protection scheme based on local information is proposed, which is easy to implement and economical at the same time.Firstly, the contribution levels of different IIDG power states to the fault current and their influence on the protection performance are analyzed, and the IIDG power is clustered into multiple state sets. Secondly, a fault current calculation method considering topology changes is proposed, and the protection is calibrated offline by combining the power curves of distributed power sources and multiple operating states of the distribution network, judging the operating state and switching the protection value through multi-point measurement information. Finally, the effectiveness of the proposed method is verified by PSCAD/EMTDC simulation,and the proposed method can effectively enhance the adaptability to the topology change of the distribution network while taking into account the fluctuation of IIDG output, which provides a reference for the optimization of the protection scheme after the high proportion of new energy access.