Finite element method procedures of solution of masonry walls during non-stationary dynamic processes allow taking into calculations tensile and shearing strengths of brick and mortar, as well as, geometrical non-linear behaviour of those brick walls, i.e., large displacements, rotation and bending at conditions of three dimensional state of deformation. Numerical results obtained for 3D-deformation and failure process of brick wall model with a thickness of 0.25 m, 2 m in length and 0.54 m in height loaded explosively in variants of charge mass 1 kg and 1.8 kg at the distance of 2 m were compatible qualitatively with experimental results for this considered wall analyzed for various types of its reinforcements. These retrofits have caused considerable resistance of such protective masonry wall against explosive aerial shock wave.