The current study was aimed at investigating some acoustic characteristics of Occlusive (O)-weakening in French Parkinsonian Speech (PS). Compared to Control Speech (CS), PS exhibit an increase in the reduction and assimilation of Os to context. At the acoustic level this is reflected by a larger number of absent bursts, a decrease in energy, a change of Os into their sonorant and fricative counterparts and omissions of speech sounds. In PS, the rigidity of muscles and the difficulty in initiating movements result in a decrease in the amplitude of speech gestures. O- weakning which is the consequence of PD production deficits appears to be influenced by the inherent-articulatory characteristics of consonants and is highly variable.