The invention discloses a distribution network planning method taking into account distributed power source and electric vehicle access,.The method includes investment cost and operation cost of DG unit expansion, investment fixed cost and investment variable cost of substation expansion, investment fixed cost and investment variable cost of line expansion, purchase cost of main network, power shortage cost of system, investment cost of capacitor, and objective function of distribution network planning model. Power flow balance constraint based on system, Line constraint, substation constraint, DG installation constraint, capacitor constraint, electric vehicle PEV charging constraint, system reserve constraint, voltage constraint and budget constraint, determine the optimal upgrade capacity of substation, distributed generation, reactive power compensation capacitor and line, and obtain the upgrade plan set to be inspected; Based on the set of upgrade plans to be verified, the optimalupgrade plan and the implementation time of the optimal upgrade plan are determined by using a predetermined algorithm.