Abstract: In practical applications, multi-agent systems may be attacked continuously or intermittently by malicious attackers within a certain period time, resulting in being blocked of communication channels between agents. In view of this phenomenon, the communication time between agents random, that is, the communication time interval is composed of deterministic preparation time and random communication time period, so as to reduce the risk of malicious attack on information in the communication process. By using ternary control method and random analysis technique, the sufficient conditions for the concensus of multi-agent systems under jamming attack are obtained. The effectiveness of the obtained results is verified by the numerical simulation of an example.