A photonic crystal fiber for broadband dispersion-compensating with low nonlinearity in a wide wavelength range centered at 1 550 nm is designed, and the effects of the number of air-hole rings, the air-hole diameter and the lattice pitch on both dispersive and nonlinear properties are numerically described by using the vectorial beam propagation method. The results indicate that the inner six air-hole rings have stronger impact on the dispersive and the nonlinear properties. By optimizing and adjusting the diameters of the inner 4th to 6th air-holes and the lattice pitch, the proposed photonic crystal fiber can compensate (to within 0.5%) the dispersion of 190 times of its length of standard single mode transmission fiber over the entire 100nm band centered at 1 550 nm, while also can remain the nonlinear coefficient lower than 3 W-1?km-1 over the wide wavelength range.