GB/T 43785-2024 "Optical clock performance characterization and Measuring method" describes in detail the main parameters used to characterize the performance of optical clocks and their Measuring methods. Optical clocks are atomic clocks that use the energy level transitions of atoms (ions) in the Optical inspection band as a Frequency reference, and are widely used in the design, development and production of optical clocks for performance evaluation. Key terms and definitions are clarified in the standard, such as "optical clock" and "measurement uncertainty", the latter refers to the parameters used to characterize the dispersion of the measured value. This standard refers to GB/T 23717.2-2009 "Mechanical Vibration and Impact - Vibration and Impact in Buildings with Sensitive Equipment - Part 2: Classification" and GB/T 27418-2017 "Evaluation and Representation of Measurement Uncertainty" to ensure the accuracy and applicability of the standard.