In this paper, we investigated the accuracy of negative utterance sentences in order to judge drinking. Drinking makes it difficult to pronounce specific sounds correctly. Many speech parameters have been studied to identify inaccurate pronunciation features. Generally, the method of grasping the inaccurate pronunciation is analyzed by using the change of pitch and formant. Formant has various information such as individual s uniqueness, clarity and physical condition, and pronunciation state can also be analyzed. Analysis of pronunciation through pronunciation agencies may lead to difficulties in analysis due to differences in pronunciation of individuals. On the other hand, analysis of pronunciation through the vocal organ is easier than analysis because consonants or vowels are applied only at the same time, rather than analyzing the pronunciation. Especially when drinking alcohol, the vocal cords are dehydrated. Therefore, it is difficult to elaborate vocalization or to utter a specific tone. Therefore, in this paper, the research was conducted to extract the parameters of alcohol discrimination with the change of the accuracy of the voiced sound according to the vocal sentences. As a result, the longer the sentence was, the more pronounced the error was.