Proton exchange membrane fuel cell(PEMFC) stacks with external and internal humidifier were made, and those performance were measured and compared each other. After measuring temperatures of the individual cells in the both stacks, we examined the correlation with these performances. The decrease of performance caused by scale-up and stacking could be explained by higher contact resistance of membrane-electrode, higher contact resistance between one individual cell and another, hindrance to provision of reacting gas and to remove generated water. The performance of the external humidifier stack was greater than that of the internal humidifier stack. Humidification is important to the stack performance. Cell performance improved in the middle individual cell of the stack for the external humidifier stack and in the individual cell closed to internal humidifier for the internal humidifier stack. Temperature and performance distribution in the individual cells of the both PEMFC stacks have much correlations with humidifier type of stacks.