The resistance characteristics of aero-engine high-altitude ice crystal particles will affect the movement of ice crystals. In order to explore the influence of different shapes of ice crystals on the drag coefficient, the paper adopts the method of high-speed camera tracking to investigate the drag coefficient of spherical particles and non-spherical particles (long cylinder, short cylinder and disk). The Reynolds number and drag coefficient of different particles are obtained according to the velocity of particles at uniform velocity, and the correlation formula for calculating drag coefficient of different particles in the working condition range is obtained by fitting experimental data. Finally, the correlation formula is verified by using experimental data other than fitting data. The results show that the Reynolds number ranges from 3961 to 24144. The average relative error between the calculated and experimental values of the four particle resistance coefficients is less than 5%.