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Methanol has many advantages as a fuel for fuel cells compared with hydrogen. The direct methanol type system consists of simple and compact equipment, and suited for automobile use. This research analyzed characteristics of power output and thermal efficiency in a direct methanol fuel cell. The measuring system for low concentration methanol in a water solution using the non-dispersive infrared (NDIR) was developed. Influences of electrolyte membrane thickness, cell temperature, and methanol solution concentration on power output and thermal efficiency were analyze.