Waveguides′ dispersion characteristics are studied.The conclusion shows that if changing the slot′s structural parameters,the value of the slot waveguide′s dispersion is also changed when the optical frequency is around 1.55 μm,and the values are all smaller than -1 000 ps/(nm·km).The minimal one is about -6 700 ps/(nm·km),and its Relative Dispersion Slope is smaller than 0.009 nm-1.By selecting suitable slot′s structural parameters,silicon slot waveguide could be used to compensate the residual dispersion of optical communication link,and it has more advantage than DCF.