The emulsified diesel fuel, which could be stably stored at room temperature, was prepared by homogenizer and mechanical stirring. The mass ratios of diesel, water and additives were determined. The fuel consumption on different working conditions of emulsified diesel were tested on engine test bench, and the oil-saving rates were determined. The physicochemical properties of the emulsified diesel fuel were measured and comparatively analyzed. The emulsified diesel were prepared when the additive content was 2 wt %, water blending ratio were 10 wt % and 15 wt %, respectively. The results showed that the oil-saving rates of emulsified diesel were different on various working conditions, and the highest oil-saving rate was 6% . The physical and chemical indexes of emulsified diesel fuel conformed to the national standard, and the emulsified diesel seemed clear and transparent, the stable period was more than one month.%采用均质机和机械搅拌相结合的手段制备了能够在室温下稳定储存的乳化柴油，确定了柴油、水、添加剂的配比。对制得的乳化柴油在发动机台架上进行不同工况的油耗试验，确定节油率。对乳化柴油理化性能指标进行了测定。实验结果表明：添加剂为2 wt%，掺水率为10 wt%、15 wt%时制备的乳化柴油在不同工况下，均有不同程度的节油，最高节油率达到6%。乳化柴油理化指标符合国家标准，乳化柴油为澄清透明状态，稳定期可达一个月以上。
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