Abstract: High voltage electric pulse crushing is a new type of crushing technology. Compared with traditional mechanical crushing， it has advantages of low energy consumption， high degree of coarse grain dissociation and low mechanical properties of crushing products.The fractal model of the crushing product size and the relationship between fractal dimension and yield under the screen were established to study the particle size characteristics of high-voltage pulsed discharge crushing products.The results show that as the number of pulses increases， linear regression coefficient increases， fractal dimension decreases， residual sum of squares decreases， and the area of calculated value curve and experimental value curve decreases. As the grain size increases， the linear regression coefficient decreases， fractal dimension increases， and the area enclosed by the calculated value curve and the experimental value curve increases. Fractal law provides a new way to study the particle size characteristics of ore crushing.

Key words: High voltage pulse crushing, Fractal dimension, Regression coefficient, Residual sum of squares