By the experimental data of the forefathers and the dew point pressure of the gas condensate reservoirs derived from different parts of the domestic

we make an empirical correlation expression for the calculation of the dew point pressure based on the genetic algorithm（GA）. This expression considers more factors than that of other existing models including the temperature

fluid compositions

molecular mass and density ratio of heavy constituent

gas-oil ratio. The calculation results are more closed to the experimental data than the previous test values. The average of the relative error

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s absolute value is 3.05 %. In order to further verify the new empirical expression

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s prediction ability

the experimental data of other 10 groups of dew point pressure are

compared with the results calculated by four models that is the N-K

Elsharkawy

Sun Zhidao

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s model and Wang Haiying

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s model. The results are relatively high in accuracy with the absolute value of 1.79 %. The absolute values of other four models are 49.53 %

27.05 %

3.30 % and 7.05 %.