Patent ID: 8782569

Claim:
An inspection method for a photo-mask in a semiconductor process, comprising: providing a first photo-mask with a first wafer anchor point (1st wafer FAM); calculating maximum photo-mask error tolerance (D max ) and minimum photo-mask error tolerance (D min ) according to the 1st wafer FAM; providing a second photo-mask with a second mask anchor point (2nd mask FAM); measuring a critical dimension (CD) average, and a CD range of the second photo-mask; inspecting the second photo-mask by using equation A and/or equation B by a computer system: CD average−2nd mask FAM<D max −CD range/2 (equation A) 2nd mask FAM−CD average< D min −CD range/2 (equation B); and wherein the 2 nd mask FAM, the CD average, and CD range do not match equation A and/or equation B, the second photo-mask is dismissed.