Abstract: With the integration of large scale and high proportion of distributed generators into the power grid operation, the distributed economic dispatch system has received more attention due to its significant advantages. However, the distinctive distributed communication architecture, the iterative solving process of optimization problems and the multi-stakeholder participation mode of the system provide a broader spatiotemporal landscape for implementing cyber attacks originating both internally and externally to the system. The modes and methods of attacks are consequently more intricate and diverse. Addressing information security problems is a vital prerequisite and foundation for enhancing the practicality of distributed economic dispatch system. This paper aims to summarize the current research status of potential information security problems and response measures in distributed economic dispatch systems. Firstly, the adaptability of various communication technologies in the power system to distributed economic dispatch systems and the security risks inherent in communication technologies are discussed. Secondly, two typical information security problems, i. e., external cyber attacks and internal malicious behavior, are introduced, and relevant characteristic analysis and impact assessment are conducted. Then, the detection, prevention, and suppression measures and methods for two types of information security problems are summarized and analyzed. Finally, the establishment of an information security problem model and the construction of an integrated security defense system are discussed.