This invention is about one vehicles back-draft path aiding method, provides the driver in the vehicles back-draft when knew in advance that vehicles' back-draft path, it is mainly carries on because of a phantom technology application and the steering wheel corner signal by way of the path information bank or mathematics equation the operation, and will operate the result to paste in the image output display unit picture, and using supersonic wave distance-measuring radar obtained with obstacle distance, supplies the internal image process the adjustment reference, so as to provides one can the immediate rapid reaction, the serviceability with install the simple vehicles back-draft path aiding method high, reduces the manufacturer and the consumer cost burden effectively.