Abstract: The Fraunhofer diffraction of random distributed circular holes is analyzed using the Monte-Carlo method and is compared with the diffraction distribution of a single circular hole. It is shown that the diffraction pattern of the random distributed circular holes has the same geometry characters as that of a single hole with the same radius. The former has a power stronger than the latter and has a very strong point in the center. Besides, the diffraction field of multi-holes has an unsmooth distribution which is similar to be added some noises. These conclusions are in agreement with the experimental results.

Key words: circular aperture diffraction, Monte-Carlo method, demonstrated experiment