The relation between drag coefficient C of a body in fluid and its Reynolds numberRewas analysed by third order polynomial fit for logC and logRe. All flying parameters were calculated by increment method. A program was written＇ by Fortran language. Different effects of particle size, initial flying velocity and angle, pressure of the atmosphere, and density of powder were discussed. The drag force can reach very high value upto 522 - 7800g for fine powder of 10 - 60μm. Flying distance in horizontal direction could be shorten if flying is oblique because the huge drag force for finer particles make their velocity decreased dramatically.