The grid?connected inverter?interfaced distributed generation transforms the power supply mode of the system from the original single power supply to a multi?power supply, which brings many challenges to the traditional relay protection, and may cause the protection device to fail or malfunction. This paper takes the inverter?interfaced distributed generation with low voltage ride?through characteristics as the research object and analyzes its influence on relay protection after it is connected to the distribution network. A multi?objective programming model considering the capacity and comprehensive cost of the inverter?interfaced distributed generation is constructed and also takes into account current protection, node voltage and location constraints without increasing the investment cost of the distribution network relay protection. The particle swarm optimization algorithm is used to analyze an example in the IEEE33?node system. The results show that the configuration scheme of the inverter?interfaced distributed generation considering the current protection constraints can ensure the regular operation of the original protection device of the system when the fault occurs, which verifies the necessity of considering the current protection.