The PCF frame of clock synchronization protocol of Time-Triggered Ethernet is the core element to determine whether the network can work normally. Once the attack against PCF frame occurs, the timing of Time-Triggered Ethernet may be disordered and paralyzed. In order to better analyze the attack behavior, a performance evaluation method was proposed, which can effectively assess the capabilities of attackers and the impact of attacks. Firstly, based on the different stages of clock synchronization process, the implementation process and impact of the attack were analyzed in detail, and the attack classification framework for PCF frame was established. Then, the elements of attack behavior were analyzed and extracted, and combined with the quantitative parameters, the quantitative mathematical expression of attack behavior performance was derived. Finally, a typical example is given to illustrate the application of the proposed method. The results show that the method can reasonably evaluate the attack effectiveness.