Abstract: A parallel vector finite element domain decomposition method is employed to analyze a new-style antenna with waveguide side feed.In this method, edge-based vector elements are employed to avoid the spurious solutions in traditional method of node-based elements.However,on single personal computer,the finite element solution of large-scale problems faces the problems of low operating efficiency and insufficient physical memory.A non-overlapping domain decomposition method is introduced to overcome these problems.The original large domain is divided into a series of small sub-domains,which can be analyzed independently. Hence,this method can easily be parallel implemented to improve efficiency and relieve memory requirement.Numerical experiments of new-style antenna with waveguide side feed demonstrate the accuracy and efficiency of this method.