Abstract: As the input for seismic analysis of structures, the appropriate selection and utilization of ground motion time histories directly affect the reliability of seismic analysis results. Based on the relevant requirements of Chinese seismic design codes for input ground motion time histories, this paper proposes a optimized method for selecting natural ground motion. This method integrates ground motion intensity, spectral characteristics, and ground motion duration while aligning with code-prescribed criteria for target spectrum compatibility and spatial coherence, enabling efficient selection of three-component natural ground motions. The method proposed in this paper has stronger practicality and operability, providing scientific basis and technical support for the selection of ground motion acceleration in engineering practice.