Cleft lip and palate is the most common deformity among the facial congenital anomalies. And although many research and studies of operative methods haute been performed, the actual measurement of length of alar flaring have not been reported in cleft lip and palate. For this, authors chose the length of alas rim and nostril sill, which are an objective parameter, to measure the complete and incomplete cleft lip before the remedy and it was proven by a numerical value that compare to the normal part, the length was elongated. Also we found elongation of the cleft side alar rim in which patients had been operated by triangular flap method. We propose two surgical operative methods of the correction of lengthened alar rim; 1 partial resection of the elongated alar rim. 2. conversion of ala into nostril floor (Millard II operation) We conclude that this study is more accurate correction of the nasal deformity by measuring and understanding the length of alar rim in cleft lip and palate patients.