Parkinson’s complaint( PD) is a sluggishly progressing and largely enervating neurological complaint of the central nervous system, and further than 8 million people suffer from this complaint worldwide. exploration indicates that as numerous as 89 of cases living with PD develop speech signs( K and Lena, 2017), nominated hypokinetic dysarthria. These abnormalities are generally characterized by reduced oral loudness, poor phonation quality and reduced prosodic pitch. The base of oral product depends on the close cooperation of colorful oral organs and sub-organs, including the larynx, oral cords, oral depression and nasal depression, to laboriously help the functional collaboration of respiratory muscles. Speech is generated by the vibration of oral cords, and the frequency of their vibration determines the pitch, while the timbre of speech is nearly related to the formants produced by the air inflow through the oral tract. Formants not only constitute the decisive factor of sound quality but also reflect the physical characteristics of the sound channel (reverberative depression) The pronunciation of vowel formants is one of the foundations of speech conformation and plays a tone-apparent part in the composition of individual speech.