Abstract: A method for SMN genes identifying is disclosed, as well as a method for spinal muscular atrophy carriers screening. The method comprises steps of following: (a) providing a genomic DNA; (b) amplifying the genomic DNA with a pair of primers; and (c) injecting the amplified product into DHPLC (Denaturing High Performance Liquid Chromatography). The method of the present invention can identify SMA patients, and also the carriers of SMA.