Abstract: In view of the insufficient consideration of distributed generators（DGs）, cyber-physical model and interaction analysis in existing assessment methods, this paper proposes a reliability assessment method for active distribution networks considering information failure in an uncertain environment. First, the model of DGs and load, the models of cyber-physical components and the model of information transmission reliability are established. Then, combining the indirect effect of cyber failure on the selfhealing process of distribution networks, the influence of different levels of cyber failure on fault isolation, location and power supply recovery are quantitatively analyzed in the uncertain environment. A reliability assessment method for Monte Carlo sampling is proposed. Finally, the effectiveness of the proposed model and method is verified by simulation examples.