Abstract: Lithium iodide is an important chemical reagent，which has advantages of high yield，stable reaction，and high selectivity as catalyst.With high energy consumption，low loss，long life，and good sealing performance，the battery grade lithium iodide has been widely used in pacemakers supply materials.Properties and application of lithium iodide were introduced. The methods，such as acetone method，hydrazine method，sulfureted hydrogen reduction method，neutralization method，liquid nitrogen method，reduction-neutralization method，and organic solvent method，for preparation of lithium iodide were sum- marized.Advantages and disadvantages thereof were discussed.Neutralization method and reduction-neutralization method  were suitable for industrial application.Several companies′ product quality standards of lithium iodide were listed.Finally，the prospect of lithium iodide industry was briefly described．

Key words: lithium iodide, preparation, neutralization method, reduction-neutralization method