Due to the complex structure and changeable operation mode, the distribution network frequently suffers from various types of damage such as a line break fault. It is reliability is relatively low since the feature of singleline break fault is not obvious and the conventional detection method is difficult to monitor effectively. In order to solve this problem, a real time monitoring method for the singleline break fault based on dualterminal information in distribution network is proposed in this paper. Firstly, the singleline break fault feature information is extracted by monitoring the relevant voltage and current signals on the power supply side and load side in real time. A comprehensive criterion is established for the identifying singleline break fault to realize the realtime monitoring of singleline break fault. This method can greatly improve the recognition accuracy of singleline break fault. Finally, the simulation is carried out on PSCAD/EMTDC. It is shown that the proposed method is not affected by the distribution line parameters and operation mode. It can effectively eliminates other faults and reliable and accurately identify the singleline break fault. Moreover, the monitoring process is accurate and fast to meet the realtime monitoring requirements for the safe operation of distribution network. It is valuable for engineering applications.