Filtering properties of multilayers folded Stainless filter elements was measured at DT100 multipass test stand.The result shows that the dirt holding capacity of the experimental filter is 501 g, filter resistance and flow injection pollutants is exponential relationship y=2523 3e0756 6x，filtration ratio remain unchanged basicly with the increase of the pressure drop, the numerical fitting relationship between filtering ratio and solid diameter is β=0022 9x3883 8，if the solid diameter is greater than the maximum pore diameter,filtering ratio is infinity, filtering ratio of nominal filtration precision 5 μm is 1187, its filtering efficiency is 9158%, but actual nominal filtration precision 804 μm.