Time-depth conversion is an important link in the use of seismic data for structural and reservoir interpretation.Previous researchers carried out a lot of fruitful work by using different methods in different geological conditions.However,the high-velocity anomaly caused by the near-source fan on the steep slope of the uplift has the characteristics of limited distribution,significant anomaly and acute change.There are some problems in the applicability of the conventional time-depth conversion method.According to the specific geological conditions of the study area,this paper proposes the technical countermeasures of time-depth conversion of the high-velocity anomaly area in Dongying Formation strata of the steep slope zone of Shijiutuo uplift.Based on an analysis of the genesis,the seismic phase technology is used to describe the high-velocity anomaly zone boundary;the seismic velocity anomaly identification technique describes the high-velocity anomaly amplitude;combined with the seismic phase,the seismic velocity and the well depth error,this method achieves the time-depth conversion,and finally obtains a more geologically meaningful time-depth conversion result.The practical application shows that the method is consistent with the conventional one in the constant velocity region,and is more consistent with the geological regularity in the anomaly area.Therefore,this methods has achieved good effect in the time-depth conversion which can strongly support the reserve evaluation of the oil and gas structure.