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Soil is the basic of a structure or construction, such as building construction also highway construction, and it-ll become a problem if the soil had a bad properties inside. Bad properties of soil can have a bad impact for any constructions. You can experience damage to the structure, something that is very undesirable in construction. Bad properties we mean here are those soil that have low shear strength, relatively large shrinkage growth, high plasticity limit. The type of soil found in the Atma Jaya University Makassar area is clay soil, so the author tries to investigate the effect of expansive soil stability based on the addition of styrofoam material in different levels of addition (5%, 10%, 15%, 20%, 25%), with the research title: “ENGINEERING PROPERTIES OF CLAYEY SOIL STABILIZED WITH STYROFOAM (C_{8}H_{8})” Based on the topic we chose, it means to require the stabilization as what the soil needs it absolutely takes so much efforts to improve the soil properties before doing a construction by enhancing the strength of it. There are two ways for enhancing soil properties, such as mechanical process and chemical process. One of the chemical process that will be applied here is with the additions of “Styrofoam” in the soil sample. The methodology we use on the laboratory testing are: moisture content testing, density testing, Atterberg limits testing, filtration analysis testing, and the compaction testing. The result is the significant change on the clay soil compaction test chart at the adding of 15% Styrofoam on the soil sample taken from Atma Jaya University Makassar-s ward. The significant changes we mean are the decreasing value of optimum water content from 23% to 16% and also value of maximum dry weight (γdry max) on the clay soil sample from 3.676% to 1.554%.