The invention discloses a S curve-based PVT control method, and solves the problems that an existing method is easy to have jitters in a running process if the acceleration is too big; the method canensure speed and acceleration continuity, and the acceleration has no jitter phenomenon when the speed largely changes in a time, thus enabling a numerical control system to be more stable in processing, and providing a higher processing efficiency; the method comprises the following steps: using S curve acceleration and deceleration to obtain a motion total time T' according to a given start/stopposition, a start/stop speed, a start/stop motion time and motion parameter limits; determining the relation between the motion total time T' and the given start/stop motion time T, and rounding theT' to the time T according to the equivalent periodic S curve if T' cannot satisfy the given start/stop motion time T; calculating the interpolation displacement under an interpolation period if the T' satisfies the given start/stop motion time T.