In this paper, the problem of event-triggered (ET) control for discrete-time dynamical systems in the presence of actuator saturation is investigated. The LQ method is first utilized to design the controller which ensures the asymptotic stability of the closed-loop systems. It is noted the proposed event-triggered condition takes the information whether the actuator saturates or not into consideration. As a result, the triggering number is reduced. To further enhance the performance, a co-design of event-triggered strategy and controller parameters is given with cone complementarity linearization algorithm solving non-convex optimization problem. There exists tradeoff between the size of stability region and LQ performance. Finally, we provide some simulation examples to demonstrate the theoretical results.