To address the performance distortion issue in the light-load region faced by the state-trajectory-model-based synchronous rectification method for CLLC resonant converters, this paper proposes an optimized synchronous rectification strategy based on the state trajectory model. Through an in-depth analysis of the DCM of the converter under light-load conditions, the boundary conditions for current DCM are derived, enabling accurate identification of the current discontinuous mode and effectively suppressing circulating current losses. The proposed method requires no additional detection devices and relies solely on basic input and output electrical parameters to achieve control, significantly reducing hardware complexity and cost. Experimental validation on an 800 W platform demonstrates that the proposed scheme achieves a peak conversion efficiency of 97.38% across the entire operating frequency range, with notable improvements in dynamic response and overall efficiency compared to traditional methods.