In this study, the relationship between index properties and swelling potential of expansive soil ofrnSendafa Town is examined.rnSoil swelling is a term generally applied to the ability of a soil to undergo large changes in volume duernto increased moisture content. One of the most important laboratory tests on expansive soils is thernswell test and indices. Commonly used laboratory index tests, (namely natural moisture content,rnAtterberg limits, grain size analysis), and swelling pressure tests were conducted in order to estimaternthe swelling potential of the Sendafa expansive soil.rnThe soil is classified under AASHTO and USCS classification system. The AASHTO classification ofrnthe study area soil falls under A-7-5 and A-7-6 and this means the soil is plastic clay which has a highrnvolume change capacity between wet and dry states. The USCS classification indicates the soil isrninorganic clay of high plasticity (CH) with a potential of expansion.rnEmpirical correlations were proposed to relate index property parameters and swelling potential usingrnsingle and multiple linear regression analysis methods using Microsoft Excel program. From singlernlinear regression analysis plastic index has a better correlation than that of the other parametersrn(indices) with comparison factors of R2 and P-Value. In the case of multiple linear regression analysisrndry density and plasticity index have a good combination effects with swelling. Results of the validityrnof the newly developed correlation with control test results shows that, the correlation of swellingrnpotential value with soil index properties