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DME has lower energy content per unit volume than that of light oil (typical petroleum based diesel fuel). Roughly 1.8 times the quantity of DME is required to obtain equivalent content of light oil. DME also exhibits higher compressibility and much lower viscosity than light oil, so high pressure injection is not easy. Currently, DME engines have utilized a larger injection volume by enlarging the nozzle diameter with a relatively low injection pressure up to 60MPa. In order to obtain higher performance in future DME engines, high pressure fuel injection is considered essential, however the high pressure DME spray characteristics have not yet been understood. In this research, DME spray characteristics of high injection pressure up to 140MPa were examined using a constant volume vessel under engine-like temperature/pressure conditions.