Abstract: In networked control systems, various constraints during the communication process can affect system performance to a certain extent. We aim to investigate the optimal tracking performance (OTP) achievable by NCS under deception attacks. Firstly, we propose a new trade-off performance index for single-input multiple-output (SIMO) systems. Based on the frequency domain method, we derive the OTP limit under the influence of deception attacks and channel noise. The deception attack under study is modeled as a Bernoulli-distributed random variable. It is assumed that the channel noise follows an additive white Gaussian noise distribution. Explicit expressions for the OTP are presented under both single-degree-of-freedom and two-degree-of-freedom control configurations. The findings demonstrate that the OTP is inherently limited by the intrinsic properties of the controlled plant, attack parameters, and channel noise. Finally, simulation verification is conducted using a given SIMO controlled plant.