The features and existing problems of Tahe Oilfield pitting corrosion testing and evaluation technology were systematically analyzed. Through 3D pitting depth sounder device and improved pitting evaluation methods, the pitting conditions of different blocks of Tahe Oilfield were rated. The corrosion behavior was analyzed and the protective effect of inhibitor and anti-corrosion effect of the new material of production system pipes on the ground were evaluated. The relationship of the mixed CO₂/H₂S environment and the pitting corrosion rate of single-well pipes and oil and gas mixed pipelines of the main block in Tahe Oilfield were obtained. At the fluid temperature of 50~70℃, corrosion pitting rate is a polynomial function of P_CO2/P_H2S, fluctuating regularly distributed. The protective effect of inhibitor craft of single-well pipes and gathering pipelines was evaluated. The results show that: for long-distance gathering pipeline or pipelines having more stations, the inhibition rate is higher in the middle of the pipeline, and the filling way of inhibitors should be segmented; for shorter-distance pipeline or pipelines having the fewer stations, the inhibition rate increased from the beginning to the end of the pipeline and inhibitors should be used at endpoint filling mode. Through the application of "pigging+inhibitor" pre-film protection technology for TH10244 single well pipe, the inhibition rate increased by 70%. The results have shown that pitting corrosion rate of new material (BX245-1Cr) coupon of gathering system of pipelines on the ground decreased by 43.7% compared with 20^# steel coupon.