Effects of reinforcements' shapes, sizes and contents on (a) von-Mises stress along horizontal line in MMCs, (b) directions and distributions of principal stresses inside particles, matrix and interface, and (c) distribution of thermal residual stress in MMCs were analysed in this investigation. It was found that the matrix-particle interfaces experience sudden change of von-Mises stress which depends on the reinforcement shape. The smoothest change of stress was occurred in triangle particle reinforced MMCs. However, the highest stress was concentrated was at the corners of the triangular particles. The directions of stress vectors depend on the shape of the particles. The extent of the von-Mises stress increases with the increase of reinforcement content and decrease of particles size at constant content.