Supercontinuum refers to the phenomenon that the spectrum of a high power pulse transmitted in a nonlinear medium is broadened by a variety of nonlinear effects. The generation of supercontinuum can greatly broaden the spectrum of optical signals, usually to the range of tens to hundreds of nanometers. In addition, supercontinuum light has the advantages of super brightness, wide band, high stability and high spatial coherence. Therefore, it has great application value in many fields, such as optical frequency calculation, optical communication, optical coherence tomography and biomedical science. In 1976, the supercontinuum in fiber was observed for the first time in nanosecond pulses generated by dye lasers, but the band coverage of the supercontinuum is narrow and the pump power required is high. The photonic crystal fiber made up for these deficiencies. Photonic crystal fiber, also known as microstructured fiber, is a special fiber whose cross section has two-dimensional periodic refractive index variation and extends indefinitely along the fiber axis. Photonic crystal fibers exhibit many special optical properties due to the variation of refractive index contrast between core and cladding. Photonic crystal fiber plays an important role in optical fiber communication, optical fiber sensing, meteorology, medical imaging and supercontinuum generation due to its flexible structure and special optical properties. Photonic crystal fiber can obtain the position of zero dispersion point at the desired wavelength by adjusting the structure, thus generating supercontinuum spectrum based on various nonlinear effects. For the generation of supercontinuum in photonic crystal fibers, the excitation conditions and the optimization and adjustment of its flatness and spectrum width have always been the focus of research. Especially in engineering applications, supercontinuum has many specific requirements. Although some progress has been made in the study of visible to near-infrared supercontinuum in photonic crystal fibers, the reported spectrum broadening is still limited and the required fiber length is relatively long. In order to improve the spectral width and make it have higher application value, in this work, based on the simulation calculation to explore the influence of optical fiber air hole structure size on dispersion, the optimized optical fiber structure geometric parameters are obtained. After independently designing the optical fiber, a kind of solid-core photonic crystal fiber with high nonlinearity is obtained by using the stack method. The full vector finite element method was used to simulate the photonic crystal fiber, and the zero dispersion point of the photonic crystal fiber was obtained at 880 nm. At the pump wavelength, the photonic crystal fiber has a nonlinear coefficient of 33.67 km^-1?W^-1 and an effective mode field area of 4.72 μm². Through the establishment of a supercontinuum experimental device, a 1 030 nm, 150 fs linear polarization ultrafast fiber source is coupled into the photonic crystal fiber, and the coupling efficiency is 52.7% at low power. The generation process of supercontinuum from visible to near infrared region is studied under different pump power and different optical fiber length. It can be seen from the analysis that when the average pumping power increases in 0.5 m long photonic crystal fiber, the output spectrum broadening increases accordingly. At the maximum average pump power of 1 320 mW, a supercontinuum spectrum with a broadening range from 475 nm to 1 870 nm is obtained, and the flatness of the spectrum is improved compared with that at low pump power. By studying the effect of fiber length on the supercontinuum spectrum, it can be found that the supercontinuum is further broadened and flatness is improved with the increase of fiber length under the condition of constant average pumping power. Finally, the broadband supercontinuum output from 450 nm to 1 900 nm was achieved in the 1.5 m long photonic crystal fiber, and the spectrum has good flatness and coherence. Such broadband light sources have potential applications in optical coherence tomography, spectroscopy, communications, early cancer detection and food quality control.