In this paper, the J-integral of commercially pure titanium (CP Ti) for standard compact tensile (CT) specimen was obtained by four methods containing fracture experiment, two-dimensional (2-D) finite element analysis (FEA), three-dimensional (3-D) FEA, and the calculation formula in electric power research institute (EPRI). Although the J-integral obtained by EPRI solution is consistent with that by 2-D FEA, they are lower than the result of the experiment. Moreover, the J-integral obtained by 3-D FEA is more close to that of the experiment. In order to improve the prediction accuracy of J-integral by EPRI solution, the improved EPRI solution was developed based on 3-D FEA and verified by the experiment. In addition, two failure assessment curves (FACs) of CP Ti corresponding to traditional EPRI solution and the improved one were compared with the experimental results, which indicates that the improved EPRI solution not only improve the prediction accuracy of J-integral, but also increases the reliability of FAC.