The out-of-core algorithm which dynamically adds hard disks to the solving process of moments(MoM) is utilized to break the memory limitation, and the parallel computing technique is adopted to accelerate the solving process of MoM. The computation of aircrafts’ bistatic Radar Cross-Section(RCS) verifies the validity of out-of-core algorithm. The parallel out-of-core higher-order MoM is utilized to analyze the radiation characteristics of airborne umbrella printing oscillator antenna array. The results show that the method can extend the scale of the problems that can be solved by using MoM through taking full advantages of computers’ hard disks.