A new methodology to evaluate the process temperature dependence of the minority carrier lifetime has been developed. A TEG layout with p+-stripes on an n-Si substrate was designed. When all the p+n junctions are made forward, the minority carrier diffusion current flows one dimensionally into the substrate. On the other hand, for making only the one center p+n junction forward, the current spreads laterally and flows cylindrically into the substrate. By the difference in the flow path of the minority carrier diffusion, we can successfully extract the minority carrier lifetime. We applied this methodology to the evaluation of the minority carrier lifetime depending on process temperatures and confirmed the lifetime degradation for high temperature process.