Abstract: The products and their formation laws of pozzolanic reaction is the focus of research in the field of lime-stabilized soil.Because of the complexity of soil components and limitation of test methods,the resuIt from directtest is anything but satisfactory. In this case,with help of thermoynamics theory,authors researched on productsformation laws of pozzolanic reaction occured in lime-stabilized soil,investigated into optimum quantity of lime,pozzolanic products formed during curing under high temperature and possibility of curing under low temperature.Some results which cannot be found from the direct test were obtained.