The invention discloses an evaluating method for a control system of an active power distribution network, and belongs to the technical field of control over the active power distribution network. The evaluating method uses a series of evaluating indexes for evaluating the control system of the active power distribution network, and the evaluating indexes include the equivalent operating cost in unit time CEAC, the redundancy RC, the control reliability CR, the control effect CE, the response sensitivity CS and the decision delay time CD. The invention further discloses a planning method for the active power distribution network based on the evaluating method. The current situation that evaluation analysis is insufficient in the aspect of the own control characteristic of the active power distribution network is changed; according to an evaluating index system set up in the evaluating method, a computing method is simple, the system content is comprehensive, economic benefits and technical benefits of the control system of the active power distribution network can be reflected fast and effectively, and powerful data support is provided for planning, operation and analysis of the active power distribution network.