With the continuous expansion of the power market, active users with distributed generation will appear. High-permeability access to renewable energy in the active distribution network will become one of the main market models. Under the influence of the market mechanism, not only the issue of profit but also the accommodation of renewable energy will be considered by active users, in order to achieve the optimal allocation of renewable energy .The access capacity of distributed generation in the active distribution network based on the joint timing scenario was studied in this paper. Firstly, a joint timing scenario for the uncertainty of distributed generation and load was established, the existing clustering algorithm was improved, and the joint timing scene reduction was efficiently realized; Secondly, the influence of network power flow optimization and voltage control on the consumption capacity of the active distributed network was fully considered in this paper. Based on the joint timing scenario, access capacity model of distributed generation were established, which considering three active management strategies such as active control, reactive power compensation and transformer on-load voltage regulation; Finally, a case analysis was made and compared with other methods depending on the historical data and IEEE 33 nodes distribution network， which verified the correctness and effectiveness of the proposed method and model in the paper.