On the basis that taking flexibility and dynamic elastic coupling of each phase transmission mechanism of P-CVT into consideration, a new parallel work of multiple-phase transmission mechanism of P-CVT is proposed, and the judge principle of transmission mechanism working condition is given. Base on accurate KED method, Kineto-Elasto dynamics model of CVT parallel multiple-phase transmission mechanism is established. Taking the typical P-CVT as an example to analyze its output speed, pulse rate and working state, the result indicated that with the increase of rotational inertia of output shaft, the transit time increased and the pulse rate decreased. The phenomenon of single phase, multiple phases or zero phase working occurred. The number of mechanisms that functions in the parallel work and the duration both increased with the increase of transmission rate. In comparison with the traditional methods, the dynamics model given in this article reflected the real movement of transmission mechanism of P-CVT accurately.