In view of the difficulty in satisfying the vibration zone striding demand because of the unclear vibration zone modeling method in the area power grid automatic generation control（AGC） software， a telemetering information-based dynamic vibration zone modeling method of unified control for the electric dispatch main station is proposed. Based on the dynamic model， the method for dodging or striding over the vibration zone of the hydro-electric units in the main station of the AGC system is further discussed. According to different base-point control modes， discussion is made on the control logic of pulling back the unit output fluctuation from the vibration zone after getting into it and striding over it on its own. On the premise that the hydro-electric units'security is ensured， the continuous regulation within the valid regulating area of the hydro-electric units can be realized by making full use of the regulating advantages of hydro-electric units. Test results from actual systems show that the method proposed can effectively improve the security of the AGC system of hydro-electric units and the area regulating effects.