Young’ s double. slit interference ( YDSl) is an important content in the courses like Optics ,College Physics , and its basic principle is widely used in engineering technology. In this paper, YDSl experiment was simulated by programming with MA'TLAB, and the simulation results straightforwardly show the effects of theslit spacing, the distance between the slit and the receiving screen and the light wavelength on the YDSlP articularly, we simulated the YDSl experiment with the white light as a light source, based on which weshowed the color spectrum of dispersion induced by the interference , and the mechanism for the change of light intensity and spectral contrast, In addition, we further compared the simulation results of measuring there fractive index of transparent dielectric films when using, separately , monochromatie and white light as light sources , demonstrating the limitation of a monochromatic light source in the experiment, The simulation experiment performed in this work is of great significance not only for deepening students’ understanding on the light interference ,but also for enriching the teaching content of YDSl, and cultivating students’ scientific exploration literacy and improving their ability to analyze and solve problems using information technology.