For long time, numerous efforts have been made to find a way of performing a comprehensive three-dimensional photoelastic analysis with a model intact, even so the problem is still far from being solved completely because of the difficulties how to realize the integrated fringe patterns obtained in measurements under continuous rotation of the prineipal birefringence axes. The final goal of this study is aimed at the establishment of new technique for analysis of internal stress distributlon in

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... three-dimensional objects, but in this paper, the authors arrange two glass disks having a different stress state respectively in series and make attempt to separate stress states in each disks using an inverse analysis method. As the result, phase diffbrence and azimuth angle of two disks is successfully separated over the whole field.