CoPt alloy films with good magnetic and mageto-optical properties were prepared on Pt buffer layer or directly on glass subst rate by sputtering a composite target. Their static recording properties were investigated. The results showed that static signals could be easily written into the CoPt alloy films without Pt buffer layers using moderate recording power. The introduction of Pt buffer layer in CoPt alloy films not only led to a smaller Kerr rotation but also greatly increased the recording power.