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The thermal decompositions of Ca-bentonites (CaB) from Santai ,Shichuan Province, China over the temperature rage of 30-1100℃ were investigated by simultaneous thermal analyzer.Non-isothermal Kinetic analysis were employed to study the thermal decomposition mechanism by using Netzsch Thermokinetics software.The dependence of the activation energy on conversion degree were evaluated by isoconversional methods.The probably mechanism and the corresponding kinetic parameters were determined by multivariate non-linear regression program.