Abstract
This article elaborated the diffraction elementary theory, and has conducted the research and the discussion with the numerical method. First carries on the direct numerical integration to the Jierhuofu diffraction formula, obtains under this theory diffraction field distribution. Then and carries on the value to the wave equation direct difference to solve, obtains the diffraction field the distributed image. Wave equation's direct solution has provided one value experiment's method. In order to be advantageous for the comparison, both take the same computation grid. The computed result indicated that both's computed result basic consistent.
Keywords：Diffraction theory Wave equation Numerical Analysis
