Abstract: Based on research of Florence model which incorporates coefficients reflecting surface dwell effect and Demar formula of ultimate penetration, an optimized method of multi-layer ceramic component armor taking basic armor into account was advanced. With the 14.5mm Armor Piercing (AP) ammunition penetrating component armor, defending armor was designed and validated by tests. It was found that the newly-designed armors have 9.8% lighter weight compared with traditional ones, which helps to optimize structure matching of face-plate, backboard and basic armor.