The Symbol Error Rate (SER) performance of the non-cooperative MPSK communication system with mismatched roll-off factor of the transmitting and receiving square root raised-cosine (SRRC) filter is studied．Simulation results show that without the prior knowledge of the transmitting roll-off factor，the optimum receiving roll-off factor with minimal performance degradation ranges from 0．4 to 0．6．Furthermore，only insignificant performance improvement can be achieved by using higher order receiving SRRC filter with higher implementation complexity．