Abstract: Centering on interfere condition of the light, the paper analysis the property of light source and reali- zation method of light interference and discusses the influence of light source on interference fringe disnrtion and quality. In die oplics teaching, il is essential to emphasis on the influence of source on the coherence property, which wild enahle students to deepen understanding tile phenomenon and essence of light interference.

Key words: light interference, polarized properties, Gaussian beam, parallel beam, spatial coherence, tem-poral coherent＇e