Four-wave mixing and wavelength conversion in the photonic crystal fiber was studied.25 meters of photonic crystal fiber was adopted due to it′s high nonlinearity and flat dispersion characteristics.When the pump power is 19.8 dBm,100 nm of the tunable wavelength conversion bandwidth and －20 dB of the conversion efficiency were attained.The experimental results show that the four-wave mixing with two signals input simultaneously does not affect each other when the signal power is below the threshold of four-wave mixing.