The dependence of field distribution and moving velocity of superposed standing- wave on the experimental parameters of two superposing travelling fields is discussed. The phenomenon that moving velocity is highly dependent on the frequency difference and the ratio of amplitudes of two travelling fields is shown. Considering the experimental situation, the effect of the angle between the two beams and the respective farfield divergence angle on standing-wave field distribution is analyzed. A good photonic crystal can be prepared experimentally by superposing two Gaussian beams with good laser spots, small far-field divergence angles which can be obtained by optical shaping device and same powers, and the waists of the two beams should be overlapped.