Most studies on the flight rules of fragments are aimed at high velocity steel fragments short-distance, while there is less study on low-density non-metallic fragments in long-distance flight. In this paper, theoretical analysis and experimental methods were combined to study the rate of attenuation of low-density non metallic spherical fragments for long-distance flight through theoretical analysis, the rate of decay fragments key parameters the air drag coefficient fragments values were corrected; through testing the pre-ceramic spherical fragments of the speed of decay were obtained. Compared with theoretical analysis, the test results show that the decay rate using this method calculated is in line with the actual law.