study the fragmentation characteristics of Shendong coal during pyrolysis process in the rotary kiln,the pyrolysis and crushing experimental of Shendong coal with a particle size of 25-13 mm were studied in a 100 kg rotary kiln. The effects of temperature,residence time and rotary speed on the degree of fragmentation and pulverization of Shendong coal were investigated. The results show that with the increase of temperature (120-700 ℃),the total fragmentation rate α of Shendong coal products increases from 20.48% to 68.74%,and the pulverization rate β increases from 1.70% to 16.55%;with the residence time increasing,the α increases from 15.66% to 68.22%,and the β increases from 1.32% to 15.71%;with the rotation speed of the rotary kiln increasing,the α increases from 17.54% to 71.43%,the β increases from 1.26% to 15.08%.Through the grey correlation analysis of the factors affecting the crushing of Shendong coal rotary kiln pyrolysis process,it is found that the three reaction conditions (final reaction temperature,residence time,rotary kiln speed) have the same order of impact on the fragmentation and pulverization rate of the product. The temperature has the largest impact,followed by the residence time,and the rotary kiln speed has the least impact. The particle size correlation function model of Shendong coal pyrolysis and fragmentation process was established,the model reflected the relationship between coal pyrolysis temperature,residence time and rotational speed on particle size  distribution,and it is verified that the relative error between the calculated value and the experimental value of the average particle size after crushing is less than 5%,which can better predict the change of the particle size of Shendong coal during the pyrolysis process of the rotary kiln.