Based on the NLS equation with which the light pulses comply when transmitting in the optical fibers,the transmission characteristics of the solitons are studied by symmetric Fourier numerical method.Different factors that cause interaction between the solitons are analyzed.The results show that the interval,phase difference and the amplitude ratio of the soliton pair are the extremely sensitive factors to affect the interaction of optical solitons.At the same time，the experimental data is introduced to calculate the influence on soliton interaction by high-order dispersion,and the corresponding solutions are given for a variety of factors.It offers reference value for actual optical soliton communication.