A concept of concentrated slowly decreasing dispersion management soliton was given. The propagation properties of the optical soliton in this system were studied from quasi nonlinear Schrdinger equation. It is shown the effect that the increase width of soliton pulse is reduced by the effect of the soliton pulse width is reduced by the fibers with slowly decreasing dispersion. When we choose right dispersion intensity number, we can get a very stable soliton propagation about the soliton pulse width, crest power and wave front.