The reality monitoring is essential to keeping our daily lives in balance. It can help us identify our thoughts， feelings and imaginations， and distinguish them from real experiences or events told by others. When the reality monitoring errors occur， individual often misidentifies internal generated events as real， ranging from experiences of confusing reality with imagination to psychotic symptoms such as auditory hallucination， the degree of which depends on the reality-monitoring ability. The reality-monitoring ability of patients with schizophrenia is obviously impaired. Research on reality monitoring can help us better understand the brain mechanism of schizophrenia and find new targets for intervention. Therefore， this paper will review the research progress on the deficiency of reality monitoring in schizophrenia.