In the recent society, we use many various tools which are made of the high polymer material for the daily life. And the new polymer material is studied, developed and invented. These materials are made on the automation line systems in the factories. The products owes a rigious test to the safety and the confidence, are shipped to the users or exported to the many countries. After testing, however, materials often contain the cracks, holes or inclusions. The stress intensity generates at the summit of the crack. may cause the big accidents. Cracks, holes or inclusions have negative effects on the rigidity and the safety. Many researchers are studying the problems about cracks, holes and inclusions in the materials, and this matter was experimented and analyzed using the polycarbonate by authors. This paper showed the mixture mode about a comparison of the distances and the angle from a summit of the crack.
