Cr (VI) in chromium-contaminated paddy soil has strong toxicity and fast migration, which poses a serious threat to rice growth and rice quality. As an essential element for human body, Cr (III) is far less toxic than Cr (VI). Therefore, the reduction of highly toxic Cr (VI) into Cr (III) is an important way to repair chromium-contaminated soil. In this study, potassium dichromate was used to simulate exogenous chromium pollution. A pot experiment was conducted to study the response characteristics of different chromium pollution levels and FeSO4·7H2O application rates to the soil-rice-overlying water system. The results showed that after the application of FeSO4·7H2O, the soil pH decreased, and the proportion of exchangeable Cr decreased, with a maximum decrease of 23.5 %. The proportion of stable bound Cr such as residual state increased significantly. Under the same chromium level, with the increase of FeSO4·7H2O addition, the Cr (VI) content in the overlying water decreased, and the rice grain yield increased, with a maximum increase of 30.9 %. The content and accumulation of chromium in rice grain, root and straw were as follows : no FeSO4·7H2O treatment > low application rate treatment ( 60 mg/kg ) > high application rate treatment ( 120 mg/kg ). FeSO4·7H2O could significantly reduce the chromium transport coefficient of rice, and T6 was 30.2 % lower than T4. This study demonstrates that FeSO4·7H2O drives the conversion of Cr (VI) to Cr (III) and alleviates the environmental risk of low chromium contaminated paddy fields.