偕二硝基乙醇钾是合成多硝基化合物的重要基础原料。本文论述它的新的合成方法:四硝基甲烷通过碘化钾、甲醛的还原及缩合,再经氢氧化钾处理后得到。它经济、简便而且得率较高,可达65～72％,与其它方法相比更有其实用价值。 Gem-dinitro-ethanolate is an important basic raw material for synthesizing polynitro compounds. This article discusses its new synthesis method: tetranitromethane by potassium iodide, formaldehyde reduction and condensation, and then treated with potassium hydroxide. It is economical, simple and high yield, up to 65 ~ 72%, compared with other methods more practical value.