In laser-driven flyer technology,the efficiency of laser and the velocity of flyers can be improved by the using of multi-flyers.In Order to obtain the influence of each layer in multi-flyer with different materials and thickness on the velocity of flyers,multi-flyers with different parameters were prepared by Ti,C,A1_2O_3 and Al.The multi-flyers were driven by Neodymium-Yttrium-Aluminium Garnet-Laser laser system in the energy range between 200 mJ and 300 mJ.The velocity of multi-flyers were tested by Phot...