This invention department is a power auxiliary steering control system it includes: An actuation mold train, a processing mold train as well as a vehicle condition sensing mold train, this actuation mold train may a transmission automobile steering wheel, this vehicle condition sensing mold train be possible sensing automobile vehicle speed, the wheel fast, driving condition parameters and so on steering wheel corner, and delivers the driving condition parameter to this processing mold train, causes this processing mold train basis different driving condition to control this actuation mold train, causes this actuation mold train to be auxiliary this steering wheel rotation in the opportune moment, lets the driver operate this steering wheel smoothly.