Recently, total internal reflection photonic crystal fibers are widely used in most supercontinuum generation, but the output spectra cannot be actively controlled. Allsolid photonic bandgap fibers (ASPBGF) with proper bandgap and dispersion can also be used for supercontinuum generation. The scheme is a candidate for controlling the range of supercontinuum generation because ASPBGF can work as a filter, moreover, ASPBGF is in favor of controllable high power supercontinuum generation because the core diameter has little influence on dispersion. The ASPBGF used for supercontinuum generation with a pulse laser at 1.064 μm is designed, and its groupvelocity dispersion, loss and nonlinear coefficient are calculated according to the structure and material parameters. The bandgap is included in the generalized non linear Schrdinger equation (GNLSE) through the loss dependent on wavelengths. The temporal and spectral evolutions of femtosecond pulse in the first bandgap are gained by solving the GNLSE using splitstep Fourier method. The effect of the bandgap on the spectra extension is analyzed by comparing the output with bandgap and the one without bandgap.