A combination of differential phase-shift keying (DPSK) modulation format with dispersion managed soliton (DMS) transmission technique can depress the noise and nonlinear damage, and gives additional innovative advantage in densely spaced channels at high bit rates (40 Gbit/s and more) systems. The phase jitter of root of mean square induced by multi-perturbations is analyzed by variational method in differential phase-shift keying dispersion managed solition system, which includes the amplifier spontaneous emission (ASE) noise, intra-symbol interference (ISI) between the channels. The effect area and magnitudes of multi-perturbations are given. The results declare that phase jitter induced by amplifier spontaneous emission noise is almost cubic relationship with transmission distance and phase jitter induced by cross phase modulation (XPM) is nearly linear with transmission distance. With the optimal dispersion management map strength S from 1.5 to 3.5, the perturbations are restrained. The phase jitter of amplifier spontaneous emission noise which is far below XPM's now is most decreased than the XPM-ASE and XPM. Then wave division multiplexing system is restricted by the external factor of the channel numbers increasing.