This study aims at describing the choice and selection of a language and its varieties, from the point of view of the kinds of constraints and the utterance of the speakers in the Javanese speech community in the three villages in Surakarta municipality.1hia study is based on the assumption that in a Javanese speech community there are at least two languages playing the role as communicative codes i.e. Javanese and Indonesian. In the communication process one choose between Javanese and Indonesian or the varieties of the two. The two languages and their vanities cannot be used haphazardly in all events and in all situations ; The uses of those languages must conform to social, cultural, and situational fact-ors found in Javanese society. Such lack constraints in using a particular variety of a language signals a trend of the selection of language i.e. for what specific purpose a speaker uses a language and in what situation he/she uses another. The selection of language in a society constitutes one of the features that shows a diglosic situation. In Javanese society the selection of a language is still colored by the deviation utterances of their speakers, due the interference phenomena from Javanese elements into Indonesian. Such phenomena lead to an impression that there is still an overlapping use of Javanese and Indonesian by speakers in general. the overlapping use of the two languages in the Javanese speech community of the-three villages of Surakarta indicates that the disglosic situation is not yet steady.The application of extra linguistic constraints on the choice and selection of a language is based on the concept of the components of speech, proposed by Dell Hynes (1972), and on its elaboration by Poedjosoedarmo (1979). And the analysis of speech deviation is based on the interference phenomena as discussed by Weinreich (1968), Dittmar (1976), and hababan {1977). By those approaches, the choice and selection of language and it constraints and tha application in the utterances would be able to be explained, and the social, cultural, and situational background of the unstable diglosic situation in Javanese speech community of Surakarta can be examined.