By using 1064 nm pulsed laser the front section (77 cm) of photonic crystal fiber (PCF) is pumped and 747 nm signal light is got by four-wave mixing. The end part of the PCF is tapered and has two zero-dispersion wavelengths (ZDW). The 747 nm signal light and 1064 nm pulsed laser which locate in the anomalous dispersion regime between two zero-dispersion wavelengths are pumped into the tapered PCF. Supercontinuum with more than spectral width of 600~1700 nm (at 20 dB level) is generated in the tapered PCF which has 25 μm outer diameter and 27 cm length.