1. An eye detection method of a drowsy driving alarming system comprising the steps of: binarizing a driver's face image input from a CCD camera; extracting candidate areas existing in pair into a binary face image; determining one candidate pair from among the candidate pairs as nostrils; establishing the remained candidate pairs forming equilateral triangles in relation with the nostrils as eye candidate pairs; and determining a candidate pair forming the small equilateral triangle as the driver's eyes.