Selecting limestone raw materials suitable for calcination and establishing appropriate calcination parameters are necessary approaches for producing high-quality lime.In this study，limestones from different regions were subjected to laboratory calcination experiments，with decomposition rate and activity degree as evaluation indicators，to investigate the differences in calcination characteristics among various limestones. The results show that crystal structure significantly influences the calcination performance of limestone. Fine-grained structures， characterized by high grain boundary density and short mass transfer paths，decompose more easily and exhibit superior calcination performance compared to coarsegrained or flaky layered structures.Impurity components such as Mg and Fe can promote decomposition under certain conditions，whereas Si and Al elements tend to form low-melting phases that cover the surface at high temperatures，inhibiting the reaction. However，impurity content in limestone is generally low，so the overall impact is not significant.Limestones with a decomposition rate of 95%～100% typically achieve a relatively high activity degree.Highactivity lime is characterized by high effective calcium content，fine CaO grains，and low bulk density. Continuous calcination will lead to excessive growth and over-burning of the grain，reducing activity and increasing energy consumption. In summary， the suitable calcination temperature for limestone ranges from 900 ℃ to 1 200 ℃.Due to differences in diagenetic environments，the microstructure and impurity composition of limestones from different sources vary，resulting in distinct calcination performances. Therefore，it is necessary to conduct pre-analysis of calcination performance before industrial production to develop targeted optimization parameters.The findings of this study can provide valuable references for the selection of raw materials and the determination of calcination parameters in lime production.