Abstract: Improving acidified soil to improve agricultural productivity is an important task for improving crop quality, income and developing green agriculture. Soil amendments can reduce soil acidity, increase soil nutrients, optimize soil structure, enhance microbial activity, and improve soil microenvironment, which are of great significance in remediation of the acidified soil. The causes of soil acidification in terms of the ion migration and transformation were expounded, and the classification, action mechanism, improvement effect of the soil amendments and their influence on crop growing were summarized. The existing problems of the soil amendments in terms of acidified soil improvement was pointed out. The research and development directions of new-type soil amendments as well as the influencing factors in their applications were put forward. Finally, the future development trends of the soil amendments were prospected, which could provide reference for the research, development, and preparation of the soil amendments.