Aim. The aim of this study is to evaluate the relationship between clinical and neuropsychological measures of language disorders as well as characteristics of the mental condition of patients diagnosed as having schizophrenic disorders. Method. There were 45 persons with schizophrenic disorder (ace. ICD-10) examined with The Positive and Negative Syndrome Scale (PANSS), the side effect rating scale (UKU), Wisconsin Cards Storting Test (WCST), verbal fluency task, Ruff's Test, Similarities - WAIS-R subtest, 10 graphics of The Thematic Apperception Test (TAT). Patient's speech was evaluated independently by two diagnosticians using Thought, Language and Communication Scale (TLCS). Results. Time since the onset of illness and the number of hospitalisations were associated with total TLCS scores and with most of the WCST indicators. Total amount and most of the particular language disorders correlated positively with total PANSS scores. Total amount of language disorders was connected with the number of trials, which were necessary to complete the first category and also with the global scores obtained in Similarities. There were also many correlations between particular language phenomenons and results of several neuropsychological tests. Conclusions. Correlation between psychopathological evaluation of language disorders according to TLCS and evaluation of the schizophrenic syndrome score is found to be significant. The psychopathological rating of general and particular language disorders shows significant correlations with some indicators of executive function, verbal and nonverbal fluency and the ability for abstract thinking.