In this letter, a distributed protocol for sampled-data synchronization of coupled harmonic oscillators with controller failure and communication delays is proposed, and a brief procedure of convergence analysis for such algorithm over undirected connected graphs is provided. Furthermore, a simple yet generic criterion is also presented to guarantee synchronized oscillatory motions in coupled harmonic oscillators. Subsequently, the simulation results are worked out to demonstrate the efficiency and feasibility of the theoretical results. c ⃝In the past few years, the synchronization of coupled harmonic oscillators has become a rather significant topic in both theoretical research and practical applications, which originates from two elementary reasons. 1,2The first reason is that coupled harmonic oscillators is usually viewed as a fundamental model for the study of coordination problems of networked multi-agent systems, which are simply different from general secondorder consensus problems due to its intrinsic dynamics properties. The other one is that it has a wide range of engineering applications, especially in multiagent networks involving repetitive movements including cooperative patrol, exploration, mapping, sampling or surveillance. 3 As a consequence, a large amount of synchronization protocols (or algorithms) have recently been presented for coupled harmonic oscillators from various perspectives. 1-8In a recent paper, Ren 1 investigated the synchronization problem of n coupled harmonic oscillators connected by the dampers, where the dynamics of each oscillator is given bẏwhere r i (t), v i (t) ∈ R (i = 1, 2, · · · , n,) are the position and velocity of the i-th oscillator at time t respectively, α > 0 is the frequency of the oscillator, and the distributed control input is given bywhere a ij characterizes the interaction between oscillators i and j (i.e., a ij > 0 if oscillator i can obtain the velocity of oscillator j at time t, and a ij = 0 otherwise). Accordingly, specifying n = 2 in Eq. (2), then system (1) with protocol (2) can be used to describe a basic model of two objects with unit mass connected by a damper as shown in Fig. 1. Later on, Su et al. 2 considered the same issue in a dynamic proximity network without any connectivity assumption. Ballard et al. 3 further focused on this issue in the framework of discrete-time setting, and a distributed protocol is proposed to implement synchronized motion coordination of multiple mobile robots. In addition, Cheng et al. 5 addressed the finite-time and infinite-time synchronization of networked harmonic oscillators with the external disturbance. Very recently, Zhang et al. 6,8 also taken into account the distributed synchronization problem of coupled harmonic oscillators under local instantaneous or impulsive interactions and sampled-data information with control inputs missing. 7Fig. 1. Two objects of mass m connected by a damper.With the technological appeal of digital implementations, the hybrid control technique with the form of impulsive sampled...