In order to study the effect of single-doped cement and composite curing agent (composed of cement, raw basalt fiber, lime and raw plaster) on the static characteristics of plateau lacustrine peat soil in the Dianchi Lake area, a static triaxial non-consolidation and non-drainage shear test was carried out on cement improved soil and composite curing agent improved soil at different dosage levels, and the triaxial stress strain relationship and shear strength change law of the two improved soils were studied. The results show that with the increase of the dosage, the peak strength of the main stress difference between the two improved soils increases. When the mass fraction of the composite curing agent is 15%, compared with the two doping levels of 5% and 10%, the triaxial stress-strain relationship of the compound curing agent modified soil is changed from “strain hardening type” to “strain softening type”, and the shear strength is significantly improved. When the internal structure of the improved soil is damaged, the shear strength of the cement improved soil has a large loss, while the composite curing agent improved soil still maintains a high shear strength.