The difficult in laser cutting rotary die board was pointed out,and the main technological parameter which can effect the seam width and shape was studied,the better technological parameter was obtained and have cut the rectangle seam of 1.42 mm width at cutting speed of 600 mm/min.The pulse laser cutting is a new working process,which can make the seam to contact better with the body of knife,so the strength,life and rigidity of the die board have risen.