Taking the typical lime soil grasslands,returning farmland to grass,forest and grass intercropping in karst plateau canyon areas as research objects,hierarchical collection of the entire profile soil and the improved BCR extraction method through redundant analysis (RDA) were used to analyze the morphological characteristics of soil calcium and its influencing factors under different ecological restoration models. Studies showed that under different ecological restoration states,the soil calcium,water-soluble calcium,and acid-soluble calcium had the highest mass fractions in the intercropping forest and grass,and grassland soil had the highest exchangeable calcium mass fraction. The organic calcium content was not significantly different in soils under different ecological restoration models. The calcium form to total calcium exists in the order of exchange state > acid soluble state > organic state > water soluble state. In the vertical direction,the contents of total calcium,available calcium,and acid-soluble calcium in the cultivated land and returning cultivated land in surface layer were smaller than those in the bottom layer,but surface layer>bottom layer for the forest and grass intercropping land and grassland. The organic calcium content did not change much on the profile,and the average value was about 0.33 g/kg. Available calcium and acid-soluble calcium had spatial differences and surface aggregation under different ecological restorations. There were very significant positive correlations among the basic physical and chemical properties of the soil such as pH,organic matter,CEC,total nitrogen,and available nitrogen. Through redundant analysis,it could be concluded that soil CEC,nitrogen,and pH were the main factors affecting the distribution of calcium forms. These research results are helpful for understanding the rules of soil calcium migration and transformation in karst mountainous areas. It could provide scientific basis and theoretical guidance for the restoration and reconstruction of ecological environment and soil and water conservation in karst ecologically fragile areas.