Systematic review of patient-reported outcome measures (PROMs) is crucial for identifying high-quality PROMs for research and clinical practice. It ensures reliable health outcomes data collection. But current PROMs systematic review reports vary in quality and have many defects. To address this, in 2024, the guideline research team updated and published the COSMIN guideline V2.0 for PROMs systematic review and two other tools in the Quality of Life Research. This paper interprets the guideline development team, method, and the core content of the COSMIN guideline V2.0. It also uses specific examples to promote standardized PROMs selection and clinical application, aiming to help domestic researchers improve the quality of such systematic reviews.