With large-scale distributed generation access to distribution network, the uncertainty of network operation increases, active distribution network requires high observability and controllability of the network, AC/DC hybrid distribution network’s operation is more flexible and reliable, it’s the development trend of distribution network in the future. In this paper, network reconfiguration and DG reactive power compensation of active distribution network are considered.The exchange power evaluation model between AC/DC distribution network and transmission network based on second-order cone programming is established. So the exchange power flexibility range between distribution network and transmission network is solved. This range can provide a certain technical reference for the operation and dispatch of the distribution network and transmission network. Solution of 94-node example verifies the validity of the model. The results show that the AC/DC hybrid power distribution network has a larger flexible range than AC distribution network, VSC capacity and DG output level are related to the flexible range.