The nonlinear generalized Schr?倠dinger equation was applied to describe supercontinuum generation, whose evolution is simulated by numerical methods in the normal-dispersion regime of high nonlinear photonic crystal fibers (HN-PCFs). The effect of the pulse parameters such as the peak power of pump pulse, pulse width and the frequency chirp on characteristics of the supercontinuum spectrum was analyzed. The numerical simulations show that with the increase of peak power, the spectral width becomes wider and flatness of supercontinuum becomes better. With the increase of pulse width gradually, spectral width becomes narrower and the flatness of supercontinuum becomes worser. It is investigated that a broadband and flat supercontinuum was generated with proper positive and negative chirp pulse in transmitting along high nonlinear photonic crystal fiber.