Supercontinuum generation by dual-wavelength pumping in photonic crystal fiber(PCF) with threezero dispersion wavelengths is proposed. The spectrum extended from near infrared to mid infrared. Evolutions of pulse are modeled based on the nonlinear Schrodinger equation by predictor- corrector split- step Flourier method when the pulse travels in a tellurite PCF. The impacts of the fiber length and pulse peak power on the spectrum are discussed respectively. The result reveals that a combined visible and infrared supercontinuum spectrum spanning from 690 nm to 3150 nm after 10 cm traveling distance when the fiber is pumped by two pulses centred at 1 μm and 2 μm simultaneously with pulse width of 100 fs, repetition frequency of 200 kHz and peak pulse power of 10 kW. The spectrum has good continuity and flatness.