Crystal structure models of complex compounds [Pd(CH3NH2)4][PdBr4] (sp. gr. P4/mnc (128), a=10.6866(7) Е, c=6.7262(3) Е, V=768.16(10) Е3) and [Pt(NH3)5Cl]Br3 (sp. gr. I41/a (88), a=17.2587(5) Е; c=15.1164(3) Е, V=4502,61(10) Е3) has been determined by using the developed multipopulational parallel genetic algorithm (MPGA) and x-ray powder diffraction data. This paper presents the methodology and results of the structural analysis of these compounds obtained by application of the MPGA.