As the development of grid technology，a further study of evaluation techniques for active distribution network is also necessary． Evaluation methods of active distribution network are not similar to that of the traditional one because of their great differences，such as network structure，trend of flow，etc． A reliability evaluation method for active distribution network considering distributed generations and batteries is proposed． Firstly，a Monte Carlo simulation is implemented to obtain system states． Then，the power flow results obtained by an improved back /forward power flow calculation method is used to calculated the index values，and a comprehensive evaluation index value is then computed． Finally，the effectiveness of the proposed method is proved by nine cases．