To realize frequency-doubling of ultrashort pulses,optical design software is employed to design the frequency-doubling system for 10 fs、0.8 μm ultrashort pulses in which contains four prisms,two lenses and a nonlinear crystal and all of them can be made by common glass materials.Firstly,the principle of frequencydoubling system is introduced.The optical system requires that all of frequency components can reach phase matching in nonlinear crystal and the merit function is built based on this point.The quality of the optical system is evaluated by permitted angle.Consequently,the optimization is executed for parts of fundamental wave and second harmonic wave.Size of prisms,distance between prism pairs and focus length of lenses which can make each frequency component in fundamental wave or second harmonic wave strike into nonlinear crystal in phasematching direction or superpose in space without spatial chirp are obtained.In addition,a macro program to compute group delay dispersion in optical system is used as an operand to control group delay dispersion in optical system.Finally,in order to reach optimal second harmonic generation,fundamental wave has no chirp at the center of crystal and the part second harmonic wave passes by introducing group delay dispersion to compensate the chirp in second harmonic wave.Then chirp in second harmonic pulse is eliminated and high quality second harmonic pulse output is obtained.