This peper presents how a new and simple technique refered as to Dual Fringe Patterns Phase Shifting Interferometry to be used in holography interferometry for automated phase evaluation of time dependent problem. The novel feature of the technique is that two fringe patterns with exactly desired phase shift can be obtained simultaneousely. Although, the phase distribution of the two fringe patterns could vary with respect to time due to the effect of environmental disturbance, the phase shift between them is fixed. The technique is based on the combination of spliting fringe pattern, polarization phase shifting and two dimensional digital FFT schemes.