Abstarct: Abstract Chemical stabilization is one of the most widely used techniques to improve the engineering characteristics of soils in order to achieve the geotechnical features of the design. The chemical process in soil stabilization ensures the increase of soil bearing capacity and the reduction of soil permeability. But on the other hand, depending on the chemical agent used, this technique has negative effects and environmental pollution. Today, the emergence of biopolymers derived from natural sources with low energy levels can be considered as one of the environmentally friendly solutions to replace chemicals. Studying the complexity of the geotechnical behavior of the soil caused by the heterogeneity of the soil environment and its effect on the efficiency of the stabilization method is another goal of this research. Therefore, several uniaxial tests have been performed on sand mixed with 0, 10, 15, 20 and 25 percent by weight of kaolin clay. For comparison, soil samples with 0.5, 1, 1.5 and 2% by weight of guar gum biopolymer and 0.5, 1.5 and 2% by weight of xanthan gum biopolymer and also with 5, 10 and 15% by weight of cement and 4, 6, 8 and 10 percent by weight of lime are fixed as a chemical substance. Also, the effect of time was evaluated by testing on stabilized samples with curing times of 7, 14, and 28 days. The results of the tests among the biological additives, guar biopolymer has the highest compressive strength and shows a growth rate of 7.402% compared to the maximum resistance of xanthan. In conditions of increasing concentration and also increasing the processing time, guar has a better performance than xanthan in stabilizing clayey sand. And from the point of view, it can be a very good substitute for chemical additives such as lime and cement.