The Cleft palate is a physiological defect or a condition that affects one or more articulators especially the hard palate, the soft palate and the uvula. Driven by the principles of articulatory phonetics, we came with a series of assumptions: H1: The posterior consonants will be affected; H2: The anterior consonants will be relatively well performed; H3: The oral-nasal contrast will be difficult to achieve for both consonants and vowels; H4: Some syllabic structures will be deviated. Based on the results obtained using the observation forms and language tests, we find the assertion of three of these assumptions with the details below: H1: The posterior consonants are actually affected by the disease: the palatals, the velars and the uvulars; H3: The oral-nasal contrast is difficult to achieve for both consonants than vowels; H4: Some simple and complex syllabic structures are deviated; The assertion of these three assumptions leads to the following explanations: • The deviation observed in the posterior consonants was seen especially at the point of articulation due to the fact that their point of articulation is fault (H1). • The nasal-oral contrast is difficult to achieve because of the velar insufficiency (H3). • The syllables are modified in most cases because of the presence of uvular [R] among them (H4). We have found a reversal on the second hypothesis (H2), because the consonants are also affected earlier than later, especially vis-à-vis the standard oral-nasal. However, just three of them remained unchanged from [m] [n] [l]. This pathology, the cleft palate, has not only linguistic implications but also has social, physical, and educational impacts. Available and mentioned treatment in our work begins with a diagnosis, a treatment and rehabilitation.