Abstract: In order to study the optimal conditions for extracting available cadmium from different types of soil with CaCl₂, different concentrations of CaCl₂ were used to extract available cadmium from sierozem and paddy soil with different extraction times. The results showed that: the extracted cadmium by CaCl₂ was water-soluble and exchangeable cadmium, and the extracted contents increased with the time prolonged. The extracted cadmium by 0.01 mol/L CaCl₂ from paddy soil reached equilibrium after 3 h and accounted for 4.68%-54.90% of the sum of water-soluble cadmium and exchangeable cadmium; the extracted cadmium by 0.01 mol/L CaCl₂ from sierozem reached equilibrium after 3 h and accounted for 3.60%-3.89% of the sum of water-soluble cadmium and exchangeable cadmium; the extracted cadmium by 0.1 mol/L CaCl₂ from paddy soil reached equilibrium after three hours and accounted for 83.28%-90.32% of the sum of water-soluble cadmium and exchangeable cadmium; the extracted cadmium by 0.01 mol/L CaCl₂ from paddy soil reached equilibrium after 3 h and accounted for 44.21%-45.26% of the sum of water-soluble cadmium and exchangeable cadmium. It indicated that 0.1 mol/L CaCl₂ was more suitable than 0.01 mol/L CaCl₂ in available cadmium extracting for paddy soil and sierozem , and their equilibrium time was 12 h and 3 h, respectively.