A field experiment was conducted in a Cd-contaminated paddy field in Liuyang City, Hunan Province, and the remediation effects of combined amendment LS (limestone + sepiolite)and application of silicon fertilizer were studied. The results showed that:(1) Application of silicon fertilizer (90kg/hm2) to the soil and treatments of spraying foliar silicon fertilizer (0.2, 0.4g/L) showed no significant effects on soil pH values, while all treatments with LS application (2250, 4500kg/hm2) significantly increased soil pH (P