To solve the problem of high energy consumption in cassava alcohol production industry and reduce overall energy consumption,the paper focuses on energy saving in pre-treatment of raw material,optimization of grinding and cooking processes,fermentation using of high-concentration mash,differential pressure distillation and heat pump technique etc..The results show that 3.78% ~ 6.62% of electricity and 3.82%~6.69% of steam could be saved by peeling and cleaning cassavas.Furthermore,increasing the grinding grade and fineness and decreasing the cooking temperature save 32.15% of steam.Meanwhile,more than 40% of steam could be saved via differential pressure distillation compared to normal pressure distillation,and 10.21%~9.73% of steam could be saved by using heat pump for recycling of effluent residual heat.