The use of biometrics has been proposed as a solution to these many needs. Biometrics is physical characteristics or personal traits of a person that can be measured, and be used to recognize the person either by identification or verification. This paper addressed the problem of biharmonic equation in human face recognition field. PDE has been treated numerically to get the discrete quantity values (matrices) using finite difference method. Three matrices in different point number are used with human face image in order to match the plot intensity image.