With the 130 patients who were diagnosed as functional articulation disorders with no physical problems, a statistical study was performed to investigate their background information and phonological processes of errors. The results are as follows: (1) Males showed higher prevalence than females, and 5-year-old-patients showed the highest in age. (2) Most patients showed errors of 2~5 phonemes (3) The most frequent errors were found in plosives and alveolar sounds, and the most frequent phonological process of errors in the aspects of manner and place of articulation were stop-assimilations and alveolar assimilations, respectively.