The beam combination characteristics of partially coherent beams, which are aligned along one dimension, are studied by use of Wigner distribution function. The formulae of intensity profiles, beam propagation factor (M²) and kurtosis parameter (K) are derived. The analysis shows that the intensity profiles,beam width, beam propagation factor (M²) and kurtosis parameter (K) are dependent on the spatial coherent length, propagation distance, separation and numbers of the beamlets.