Aiming at the problem that increasing the solid content of explosive will making influence on casting, according to theoretical analysis, three-dimensional model construction of mechanical system and customer’s actual needs, the vacuum vibration casting system is optimized. The system is analyzed and designed from eccentric block design, motor power selection and amplitude. Mechanical vibration is used in casting process. The maximum amplitude of the system is 2 mm, the mass of the vibrator is 4 000 kg, the vibration electric frequency is 20-30 Hz, the vacuum degree is less than 3 kPa. The application results show that the system can improve product density, improve product eligibility and shorten the casting cycle. The product was detected by CT without obvious flaws and bubbles, and the product acceptance is 100 %.