The Measurement and Treatment Research to Improve Cognition in Schizophrenia(MATRICS) Consensus Cognitive Battery(MCCB) was used to evaluate cognitive function, and the serum levels of superoxide dismutase(SOD), malondialdehyde, glutathione peroxidase(GSH-Px), catalase, homocysteine, and nitric oxide(NO) were measured. The gene discussed is CAT; the disease is schizophrenia.