Aiming at the problems on range’s demonstration of guided projectile for naval gun, a demonstration method of the range’s indexes is proposed. The domestic methods and current situations of demonstration on range are analyzed. Combined with the structural characteristics and working principles of guided projectile, the comprehensive balance of the demand of warships’ fire support toward the shore, the promotion and constraint of the key technologies’ development level is considered. The demonstration method of the range’s indexes is proposed. Based on the simulation model for exterior trajectory of guided projectile, simulation and comparative analysis are also carried out. The range’s indexes are obtained. The simulation proved that the research can be used as a reference for the preliminary schemes, design of related technical parameters and range demonstration of compound extended range guided projectile for large caliber naval gun.