Abstract: The demand for computing in computational electromagnetics (CEM) is continuously increasing in industry, especial in military application. Given in this paper are the results that were obtained using the parallel electric field simulation program MLFMA(multilevel fast multi-pole algorithm) on the Linux cluster of PCs connected via an 1000-based Ethernet network interface for large-scale scattering problems. Due to the high performance of the CPUs and interconnection technology, the results obtained on clusters of PCs can be compared to those obtained on expensive multiprocessor machines. A practical EM scattering engineering problem has been calculated.