Disc specimen with the center crack and edge crack simulated by two-dimensional static method is used to analyze the stress field around the crack tip in terms of the stress inten sity factor, K. A simple and convenient method of testing to realize the mixed mode stress intensity factor of the cracked body is used, The conclusions obtatined in this photoelastic analysis are as follows : 1. According to this experiment, cracked disc specimen can be used to demonstrate the mixed mode stress intensity factor analysis by simply changing the crack angle from the loading line. 2. Despite the simplicity and continuous data reading, the photoelastic method shows the slightly lower strain reading comparing to the FEM analysis method. 3. In this photoelastic analysis, K₁of center cracked disc specimen under a pair of compressive load shows negative value as the crack angle increases over 30˚.