<p>This paper studies event-triggered tracking control problem for saturated switched system based on state observer by composite nonlinear feedback (CNF). For a class of state-unavailable saturated switched systems, the full-order state observer and CNF sub-controllers are constructed. Aiming to save communication of transferring the measurement output, event triggering mechanism is presented. By adopting multiple Lyapunov function method and dwell-time method, sufficient conditions of asymptotically track of the closed-loop system are obtained. Moreover, the codesign of observer gain and controller gains, as well as event triggering strategy are provided. Through dealing with complex coupling problem, these gains are given by the solution of LMIs. Finally, a simulation example is performed to verify the effectiveness of the proposed method.</p>