In this study, we investigated the effect of the residual catalyst (Ti, Sb) on crystallization behaviors both of the isothermal and the strain induced crystallization in high speed melt spinning process. As a substitute for heavy-metal-based Sb catalysts (Sb2O3, 260 ppm), an environmentally friendly Ti-based catalyst (TiO2, 25 ppm) was used in the polymerization. The polymerized Sb-PET and Ti-PET chips were characterized by GPC, ICP. The isothermal crystallization of the Sb-PET and Ti-PET chip was analyzed by the DSC measurement and. The results presented that the rate of crystallization of Sb-PET was faster than that of Ti-PET. These results indicated that the contents of catalyst can influence the crystallization behavior, and the catalyst can act as nucleating agents. After that, the PET fiber was fabricated at various take-up velocities from 2 km/min to 6 km/min using each PET chips in the high-speed melt spinning. The crystallization behavior of PET as-spun fiber with residual catalyst types was also studied by DSC, 2D-WAXD. The strain-induced crystallization (SIC) both of Sb-, Ti-PET fibers were observed from the velocity at 5 km/min in melt spinning process. Before occurring the SIC, the degree of a structural development of Ti-PET are not different with Sb-PET. However, after the SIC occur, the Ti-PET as-spun fibers presented the relatively lower crystallite sizes and crystallinities than those of the Sb-PET. Tensile test and birefringence results also showed the mechanical strength and the degree of fiber orientation of Ti-PET as-spun fiber was slightly lower than that of Sb-PET as spun fiber. In addition, the theoretical analysis was also conducted to understand the crystallization behaviors of PET with a residual catalysts (Sb, Ti) in comparison to the experimental results.