One-at-a-Time sensitivity study can be used for the development of nonlinear system models. However in the case of a lot of different parameters it requires a lot of calculations, which can be accelerated using parallelization. In this paper, the parallelization of the One-at-a-Time sensitivity study of a Duffing-type nonlinear vibration system is presented using Maple 17 and C++. With the results it was shown that the One-at-a-Time sensitivity study of nonlinear systems can be effectively parallelized.