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Three dimensional numerical investigations of a centrifugal compressor with pitting corrosion defect preset on the disk and blade are presented by FLUENT software. The pitting defect parameters such as the velocity field and pressure distribution in the gas passage are analyzed. With that purpose, the RNG k-ε two-equation turbulence model and simple algorithm are used based on the Navier-Stokes equation. Meanwhile, the DPM model is used to simulate the second phase particles deposit around the pitting corrosion defect. The chosen model provides a reference for the compressor impeller material stress corrosion test. The simulation results showed that the velocity gradient and static pressure decreased sharply while dynamic pressure increased and the chloride concentration was 50 times higher than before in the pitting area. The results could be as guidance for compressor serving in nature gas containing chloride ion to estimate the importance of ion concentration in the stress corrosion originated pitting defect.