The impact of scratches on the mechanical properties of material of 5A06 Al alloy sheet was investigated. Through prefabricated different characteristics of scratches on 5A06 Al sheets, a systematic study about the length,depth,distribution direction and shape of the scratches was made. The experimental results show that the tensile strength and elongation rate are all decreased as the scratch depth and length is increasing. The impact is at maximum on the tensile strength and elongation rate of a specimen with scratches having vertical elongation. V-shaped scratches have a greater impact than that of U-shaped scratches. When the scratch length is shorter, the strength and elongation of specimen are decreased faster. The characteristics of scratches have little impact on the yield strength of specimen.