This paper addresses the issue of lag consensus of leader-following multiagent systems with communication delays and Markovian switching topologies.Lag consensus means that the states of the followers lag that of the leader.Based on graph theory and common Lyapunov-Krasovskii functional method,we first design a protocol ensuring the lag consensus of multiagent systems with communication delays,and then propose a Markovian jump system approach to make the multiagent systems achieve switching topologies.Finally,simulation example is also provided to illustrate the proposed theoretical result.