Abstract: The present invention provides a method and system for diagnosing a central nervous system disease, and a composition, and a kit. The diagnosing system comprises: a first detection module, used for detecting a central nervous system-derived marker in a biological body fluid of a subject; a second detection module, used for detecting a central nervous system disease-related marker in the biological body fluid of the subject; and a diagnosis module, diagnosing, on the basis of central nervous system-derived marker and central nervous system disease-related marker detection results respectively obtained by the first detection module and the second detection module, whether the subject suffers from a central nervous system disease.