Based on the foundation treatment of ShaoXing urban section of the north extension line of 31 provincial highway, the applicability and treatment effect of in-situ curing foundation treatment were studied. Plate loading test, unconfined compressive strength test, standard penetration test and static cone penetration test were carried out for different treatment methods.In order to obtain the stress and deformation law of the in-situ curing foundation, the field monitoring tests were carried out by arranging the earth pressure box and settlement plate. At the same time, the boundary conditions were simplified by the deformation characteristics of the artificial crust. Based on the principle of minimum potential energy, the simplified calculation formula for settlement of the artificial crust double-layer foundation was obtained. The test results showed that the bearing capacity of foundation were increased by at least 30% compared with the traditional method. At 28 days of curing time, the unconfined compressive strength of curing soil in-situ is 0.35~0.65 times that of indoor unconfined compressive strength. The bearing capacity of foundation was improved by standard penetration test and static cone penetration test,and the calculating bearing capacity were not much different from the measured results of plate loading test. The stress and additional stress coefficient of the two groups of road sections were analyzed, and the artificial crust layer had a good effect on the diffusion stress. And the results of the foundation settlement theory was compared with the in-situ settlement results. The results showed that the calculation settlement results of the double-layer foundation were slightly larger than the measured results, and the error was between 3% ~ 10%, which can be used as the design settlement formula of double-layer foundation formed by in-situ shallow stabilization in the engineering.