Hollow charges usually adopt compression molding process. Using the method of continuum mechanics， a finite element simulation of the compression process model was established. First， the relative density， displacement and equivalent stress change laws of the pressing process of the JO-9159 explosive were simulated and analyzed. Then， the influences of pressing rate， initial relative density and friction coefficient on the pressing quality of JO-9159 explosive are simulated and analyzed. Results show that the JO-9159 explosive powder flows mainly in the axial direction during the pressing process， and the explosive powder flows slowly near the female mold area； when the pressing rate is 0.5 mm·s^-1 and the friction coefficient is 0.25， the relative density of the charge after molding is more uniform and the amount of rebound is smaller.