The blanking clearance is a very important process parameter for the die design, which not only affects blanking power, blanking force, unloading force, the force of top pieces, but also the precision of the blanking, quality of the section and long service life of the die, etc. Therefore, in order to meet the quality requirements of the blanking parts and prolong the service life of mold, the reasonable blanking clearance is particularly necessary. A set of mold was designed to determine reasonable blanking clearance value. Several punches were applied for the blanking process at the same time, which could succeed in changing the female die rapidly without removing the mold. This method can provide different blanking clearance value and improve the experiment efficiency.