We propose the concept of partially coherent combining and demonstrate that the linewidth and polarization do not confine partially coherent combination of high power fiber lasers. Numerical calculations show when the linewidths of single fiber laser beam get larger, the far-field pattern almost does not change, but the peak power and Strehl value of far-field spot get smaller, which means the degradation of the partially combined beam. Also we compare the far-field effect of partially coherent and incoherent combination, and the numerical results show that partially coherent combined beam has much higher peak intensity and narrower intensity spot than incoherent combined beam. Partially coherent combined beam still overpasses incoherent counterpart although the combined beam is degraded by a relatively large linewidth.