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It is important to improve spray characteristics of an energy conversion engine in order to reduce carbon dioxide and exhaust gas emission. The purpose of this study is to design and develop high-dispersion injection nozzle for direct injection Diesel engine. This paper describes about that effects of the measurement and the geometric shapes of nozzles on spray characteristics and design of the nozzle which is obtained more excellent spray characteristics. When the measurement, the geometric shapes and the internal structure of nozzle were designed the most suitable conditions, breakup length becomes approximately 10 % shorter and spread of spray i.e., spray angle becomes large about 30 %. Moreover, Sauter mean diameter obtained is about order of 10 μm which is smaller than that with the nozzle developed in the previous study.