The invention discloses a positive sequence impedance differential protection method with braking characteristic for a power distribution network containing inverter-based distributed generation (IBDG). The method comprises the following steps of acquiring a three-phase current and a three-phase voltage at a protection position to acquire positive sequence impedance; carrying out information exchange between protection at two sides through an optical fiber Ethernet or a wireless communication network; carrying out calculation of action impedance and braking impedance by a local-side protection device after acquiring positive sequence impedance information and positive sequence current amplitude information which are measured by opposite-side protection; and judging whether a protected region is a fault section or not according to an action criteria with the baking characteristic. The method is applicable to circuit protection between a bus of a substation outlet of an active power distribution network and a distributed power supplies and between the distributed power supplies, the influence of fault characteristic of IBDG and through load current on protection performance can be dealt with, and the influence of a branch load on the judgment of a fault direction during an external fault can be prevented duo to the adoption of the action criteria; and moreover, data synchronism between two ends is not needed, the requirement on communication is relatively low, and the method has relatively high transition resistance resistant capability.