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The objective of this work is to analyze the macroscopic behavior of spray on the DME blended biodiesel at different mixing ratios by using spray visualization and injection rate system. The fuel spray structure of DME blended biodiesel and the development process of blended fuel spray was taken with the spray visualization system which consisted of a Nd:YG laser, an ICCD camera, high-pressure chamber and high pressure fuel supply system. The spray images were analyzed a spray tip penetration, a spray cone angle and a spray area distribution at various mixing ratio of DME by weight. The influence of different injection pressure and ambient pressure on the fuel spray characteristics are investigated for the various injection parameters.