This research  is entitled (Acoustic and alternation changes in garmyan sub dialect)) in the sound changes from the deep structure, i,e. word vocalize. It discusses the problems of i-lal process when the word changes from its origin without accurate explanation of the factors that led to these changes. This research  sought to achieve two objectives: first, to clarify how to define the form for the deletion of structure of i-lal process bay omission in the words containing weak vowels,  the establishment of the phonotics rules; and second: to highlight the reasons for changes between the vowels and consistis in the words vocalize from the deep structure to the surace structure. The method applied in this research is a descriptive analytical one where it first describes the phenomenon of analyzing sound in words and then, analyzing it according to the process of one change and writing it down in words that are analyzed bay the International phonetics Alphabet(IPA) to clarify the changes occurring. The research concluded that one of the factors for sound transfer in words is to  is to reduce utterance when adjacent sounds in the word. Changes in the syllable also occur to the number or type of syllable.