Chaos bound and its violation in charged Kiselev black hole

The chaos bound in the near-horizon regions has been studied through expansions of metric functions on horizon. In this paper, we investigate region and at a certain distance from horizon charged Kiselev black hole. value Lyapunov exponent is accurately calculated by Jacobian matrix. angular momentum particle around hole affects not only exponent, but also position equilibrium orbit. This gradually moves away with increase momentum. We find that violated there no violation when charge mass ratio fixed. small normalization factor more likely to cause violation.