Abstract: To research the particle size distribution of limestone in the impact crusher，the experiments of single limestone of different size at different angles were carried out on Bond impact crushing test machine.The results showed that:the particle size of the limestone under Bond impact crushing is in line with the Weibull distribution.The mass cumulative probability of the particles increases with the increase of the impact energy and the peak of broken particles' mass accumulation probability density function decreases with the increase of feed size.When impact energy continues to increase，the quality increase effect of broken particle size of limestone is is gradually weakened as the feed size becomes largeness after the impact energy is increased to a certain value.While the feed size is certain，the increase amplitude of fine particle diminished and the peak of broken particles' mass accumulation probability density function increases as the impact energy increases，but the width of broken particles' mass accumulation probability density function curve widens with the increase of the feed size.

Key words: Bond impact, Weibull distribution, Particle characteristics, Probability density