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A number of sour natural gases fields have been discovered around the world. Safe and effective exploitation and utilization of these gas reservoirs play greatly important role in harmonizing the development of natural gas industry and alleviating the unbalance of supply and demand for natural gas. Compressibility factor of natural gases is necessary in most petroleum engineering calculations. Some of these calculations are gas metering, gas compression, design of processing units, and design of pipeline and surface facilities. Properties of natural gases are also important in calculation of gas flow rate through reservoir rock, material balance calculations and evaluation of gas reserves. However, Sour gases contain some impurities, such as hydrogen sulfide and carbon dioxide. Usually the gas properties are measured in laboratory. But, highly corrosive and toxic properties of hydrogen sulfide, Experimental data become unavailable. Therefore, Compressibility factor should be estimated from equations of state or empirical correlations.This paper presents the results of using various equations of state, corresponding state methods, and empirical correlations to predict compressibility factor of sour gases. Capabilities of PR-EOS, SRK-EOS, DAK, DPR, HTP, HY and LXF to predict gas compressibility are thoroughly investigated. This study also reports a comparison between PR-EOS and other methods to estimate the compressibility factor of highly sour gases.