Abstract: As an effective way to increase the production of the single well,horizontal wells are more and more widely used in oil and gas exploration.In areas with large structural fluctuation,thin sand body thickness,rapid lateral change and poor river continuity,it is difficult for horizontal wells to provide guidance for geological direction.By analyzing the difficulties of pre landing guidance and horizontal section guidance,it is considered that the key technology to solve the difficulties of landing geological guidance is to accurately predict the top and bottom vertical depth of the reservoir,reasonably control the trajectory before the target and accurately judge the landing point.Setting corresponding control points,predicting well trajectory migration direction in advance and accurately judging sand production are the key technologies to solve the difficulties of horizontal geological guidance.