This paper reviewed the progress in research and application of soil conditioner.There was no uniform definition of soil conditioner at present,but there were several different classification methods.The main functions of soil conditioner included improving soil texture and structure,improving water retention and water supply ability of soil,regulating soil pH value,treatment of alkali saline soil,improving soil nutrient supply,remediation of heavy metals pollution soil,etc.In soil improvement process,the appropriate conditioner would be chosen according to the different soil obstacle problem to the good improvement effect.However,soil conditioner application also exposed a series of problems,including the potential environmental risk problem,product function orientation and awareness problem,product quality problem,packaging and marking the problem such as the disorder,finally pointed out that a scientific evaluation system of soil conditioner should be established urgently.