A method for a switching control mode of a servo control system which reduces a shock generated when switching from a torque control mode to a position/velocity control mode, the method comprising the steps of, in a torque control mode, rewriting a value in an integrator in a velocity loop for the position/velocity control mode to a value of a torque command of the torque control to thereby set a value of the integrator identical to that of the torque command, and obtaining, when switching from the torque control mode to the position/velocity control mode, a torque command value for a servo motor by using a value of the integrator of the velocity loop that is rewritten during the torque control mode, whereby continuous torque command values are given to the motor when a control mode is switched.