The supercontinuum generation in the three kinds of photonic crystal fiber(PCF) with different dispersion properties is studied by using split-step Fourier algorithm.The influences of pumping wavelength,peak power and the input pulse duration on supercontinuum generation are discussed respectively.The results revealed that the spectrum is the widest in PCF with anomalous dispersion regime,and that is the narrowest in the normal dispersion PCF under the same incident conditions.