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Background:  The most common of psychotic disorders is schizophrenia. While evaluating the cognitive function with standarized test, intelligence test is also measured by using the IQ test. For schizophrenic patients, intelligence is usually  reported  to be  lower than average.  Methods:  This research is an analytical study that commenced in January and ended in March 2014. Primary criteria is  schizophrenics  who are in-patients  in BLUD RS Jiwa Propinsi Sumatera Utara, aged between 15 to 55 years old, with highest qualification of secondary high school. The  secondary criteria included in the study  is those patients with other psychotic disorders, head injuries and other neurological disorders, endocrine disorders. The total sample is 100 subjects. Results: From this study, the corellation value is 0,876 shows a very strong corellation. And the p value  0,001, shows p<0,005. This means that there is a direct corellation between these two variables. Conclusion: The results of this study shows that there is a direct corellation (p=0,001) and a very strong corellation (r=0,876) between intelligence and cognitive  function on schizophrenics. And it is  also
necessary to do more researches by using other rating scales and examinination to measure  the relationship between intelligence and cognitive  function, and other factors that may affect results.

Keywords: schizophrenia, intelligence, cognitive function